1) What is the percentage of fresh water a) 3% b) 2% c) 97% d) 5% e) 7% f) 6% 2) What is the last layer of the earth a) Mantle b) Outer core c) Inner core d) Crust 3) The soil is composed by: a) All of above b) Air c) Minerals d) Organic matter e) water 4) What is the percentage of salt water a) 97% b) 3% c) 96% 5) To protect the litosphhere we can: a) Nothing b) Use pesticides c) Recycle 6) The layers of the earth are: a) Inner core-outer core-mantle crust b) Inner core-Crust c) Outer core-Inner core

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