1) mars and Earth are terrestrial planets, this means they are mostly made up of... a) rock b) gas 2) The suface of Mars and Earth are... a) flat b) mountainous and hilly 3) Was there once water, lakes and rivers on Mars a) yes b) no 4) How old is the Earth? a) 4.5 million years b) 4.5 billion years 5) Bio-chemistry is a) The chemistry of rocks b) chemistry of life 6) What changes happened on Mars? a) became cold and dry b) stayed wet and warm 7) Why did this happen? a) The magnetic field failed, the atmosphere escaped into space b) The atmosphere grew, trapping more heat 8) Why is the magnetic field important for life a) it lets the hot solar winds warm the planet b) It protects the atmosphere from the solar winds 9) The magnetic fields can be seen on earth, they are called the aurora borealis. What are they more commonly known as? a) The northern lights b) southern lights 10) What also happened to change the surface of Mars? a) a thunder storm b) A meteor storm

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