From the Ted Talk by Anjali Tripathi: Why Earth may someday look like Mars
Unscramble the Blue Letters
But the Earth is not alone in ureingodng atmospheric escape. Mars, our nearest neighbor, is much slmlear than Earth, so it has much less gravity with which to hold on to its atmosphere. And so even though Mars has an areoshmpte, we can see it's much thinner than the Earth's. Just look at the surface. You see craters indicating that it didn't have an atmosphere that could stop those impacts. Also, we see that it's the "red planet," and atmospheric epcase plays a role in Mars being red. That's because we think Mars used to have a wetter past, and when water had enough energy, it borke up into hydrogen and oxygen, and hydrogen being so lghit, it escaped into space, and the oxygen that was left oxidized or rusted the ground, making that faialmir rusty red color that we see.
Open Cloze
But the Earth is not alone in __________ atmospheric escape. Mars, our nearest neighbor, is much _______ than Earth, so it has much less gravity with which to hold on to its atmosphere. And so even though Mars has an __________, we can see it's much thinner than the Earth's. Just look at the surface. You see craters indicating that it didn't have an atmosphere that could stop those impacts. Also, we see that it's the "red planet," and atmospheric ______ plays a role in Mars being red. That's because we think Mars used to have a wetter past, and when water had enough energy, it _____ up into hydrogen and oxygen, and hydrogen being so _____, it escaped into space, and the oxygen that was left oxidized or rusted the ground, making that ________ rusty red color that we see.
Solution
familiar
undergoing
light
atmosphere
broke
smaller
escape
Original Text
But the Earth is not alone in undergoing atmospheric escape. Mars, our nearest neighbor, is much smaller than Earth, so it has much less gravity with which to hold on to its atmosphere. And so even though Mars has an atmosphere, we can see it's much thinner than the Earth's. Just look at the surface. You see craters indicating that it didn't have an atmosphere that could stop those impacts. Also, we see that it's the "red planet," and atmospheric escape plays a role in Mars being red. That's because we think Mars used to have a wetter past, and when water had enough energy, it broke up into hydrogen and oxygen, and hydrogen being so light, it escaped into space, and the oxygen that was left oxidized or rusted the ground, making that familiar rusty red color that we see.