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	<question>
		<phrase isaudiomp3="1" mp3="AUDIO_REPOS/1.0.mp3"></phrase>
		<question isaudiomp3="1" rationale="0" picture="images/question1.jpg" mp3="AUDIO_REPOS/2064-1" exercise_type="" questionmode="" choicemode="" answerbankid="" answerbankmode="" rationalemode="" playonload="" mp3speed="" ttsspeed="" passage="1" show_passage="" show_passage_audioplayer="" passage_audio_type="" showvideo="" video="" enable_audio_recorder="" recorder_mode=""><![CDATA[]]></question>
		<saythis><![CDATA[]]></saythis>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[LOS ANGELES  -  Scientists who study planets dream of sending a geologist to Mars.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Geologists examine rocks, and the rocks on Mars could tell us many things.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[For now, though, all they can do is study meteorites.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[These are pieces of Martian rock that landed on Earth after flying through space.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Scientists can learn a lot from meteorites.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[But often they don't agree on how old a rock is.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[This can make it hard to know what to think.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[And with certain space rocks, scientists disagree by as much as 4 billion years.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Mars itself isn't much older than 4 billion years.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Recently, a team of scientists tried to figure out how old one group of meteorites is.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[These space rocks are known as shergottites.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Most Martian space rocks are very old.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[But shergottites are believed to be very young.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Of course, young compared to other things in the solar system.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Most scientists believe shergottites were formed by volcanoes about 150 to 250 million years ago.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[That was during Earth's Jurassic period.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Dinosaurs roamed our planet then.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[If they are right, then Mars had volcanoes not too long ago.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[And that might have made life on Mars possible, said scientist Munir Humayun.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[But some people believe that shergottites are actually very old  -  about 4 billion years old.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[If this is true, other scientists will have to change the way they think about life on Mars.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA["If there is ... life on Mars, it's not going to be roaming on the surface. ... but it could be thriving underground with the heat ... provided by [volcanoes]," Humayun said.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[However, "if there [haven't been volcanoes in] 4 billion years, ... it would be very difficult to believe there was life left on Mars."]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[To settle the question, researchers examined a meteorite known as Northwest Africa 5298.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[They looked at very tiny minerals within it called baddeleyites.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[These tough minerals are "10 times smaller than ... a human hair," said scientist Axel Schmitt.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[To figure out how old a rock is, scientists measure certain parts inside it.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[But sometimes a big crash or explosion melts the rock down.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[When this happens, the evidence gets erased.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[That's why scientists picked the tiny baddeleyites: They are hard little minerals.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[It's not easy to melt them down.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[By looking at the uranium and lead inside this tough rock, the scientists found that it formed sometime around 187 million years ago.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[This proved that the baddeleyites were young.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The scientists could also see that the meteorite had been damaged.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[This was caused by whatever sent it shooting off the Martian surface around 22 million years ago.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The shock had muddled up the minerals inside.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The result was something like shaking up a sealed box of chocolates.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA["It looks good on the outside, but all the pieces are ... [broken up] on the inside," Schmitt said.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The study also shows that the shergottites weren't old rocks, Humayun said.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[But that was what he had expected.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA["If they had found that it was 4 billion years old, I would eat my hat."]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The researchers plan to study other Martian meteorites.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/2064-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Perhaps they will discover new information about our neighbor, the Red Planet.]]></answer>
		
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