Valitse oikea vaihtoehto.

1. a. It was b. There was in 1965 that the first spacecraft arrived at Mars.
a b

2. a. Was it b. Were there oceans, rivers and canals on Mars, as people used to think?
a b

3. No, but a. it is b. there is water in the form of ice underneath its North and South polar caps.
a b

4. a. It is b. There is a pity the atmosphere on Mars is so thin: without a spacesuit you would die almost immediately.
a b

5. a. It is b. There is also freezing cold on Mars.
a b

6. The diameter of Mars is about half the Earth and the total mass of Mars is only about 10% the mass of Earth, but a. it is b. there is a higher mountain there than on any other planet in our solar system (Olympos Mons, 24 km high).
a b

7. a. It is b. There are 146 million kilometres from Earth to the sun when we are closest (and 152 million km when we are farthest). The average distance from Mars to the sun is 228 million km, so the Martian year is a little longer than ours (1 year and 320 days).
a b

8. In the summer a. it is b. there is -5 degrees Celsius on normal days but in winter the temperature often drops to -82 degrees. The length of a day is almost the same as on Earth.
a b

9. a. It is b. There are deep canyons on this small planet: the Valles Marines canyon can be as deep as 7 km in places. It is also very long: it would stretch right across the United States (4,000 km).
a b

10. Mars and Earth are similar in many ways. But don't forget that a. it is b. there are differences, too.
a b

10 p