This is a thing in Amplify answer only if u've done amplify. The Chapter 2 Question is: How can we gather more evidence about whether lava or water formed the channel on Mars?

One challenge in studying the channel on Mars is that Mars is too far away for scientists to directly observe what happens there.

Based on what you learned about Gerya in the article you read today, how can scientists study Mars if they can’t directly observe what is happening there? This is a thing in Amplify answer only if u've done amplify.