Conditions necessary for life on a planet

1.      Give two facts  about  planets that are  further away from the sun.

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2.     According to the passage, what are two  reasons why life may not exist on Mercury.

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3. 3. Why is  Venus more  suitable for  plants than for humans?

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4. 4. What  three reasons  are  given to  explain  why  humans  will not survive on  Venus?

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5. 5. Earth is the only planet that  we  know of that has ____________________.

• Air

• water

• land

• Aliens

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6. 6.   What led scientists to believe that there is water on Mars?

• They saw evidence of soil erosion.

• The scientists were wet when they got back to the space ship

• The aliens told them so.

• There was a large pool of water.

7. 7. What is the  major difference between Earth and Mars?

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8. 8.      According to the  text, what are  the four  conditions that are necessary for  life to exist on a planet?

• The planet must be the right distance from the sun.

• The planet must be made of land and not only gas.

• The planet must have a lot of carbon dioxide and little oxygen.

• The planet must have a protective atmosphere that provides warmth and protection from radiation.

• The planet must have liquid water