Which of the following is a characteristic that supports life on Earth?

How many layers does the atmosphere have?

Which element makes up 78% of Earth's air?

Which of the following protects earth by absorbing radiation from the Sun?

Why is the recycling of water important on a shuttle?

How is eating different in space?

Why do astronauts need to wear special suits in space?

Which element makes up 21% of Earth's air?

For the shuttle to leave the atmosphere and travel into space, what needs to happen?

What holds the atmosphere around Earth?

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