1. The amount of solar energy that reaches the earth depends ______ the atmosphere. a. to b. in c. on d. with 2. The natural environment consists ______ all natural resources. a. in b. of c. to d. on 3. Solar energy can be changed ______ electricity. a. in b. to c. into d. for 4. All fossil fuels are ______ resources that cannot be replaced after use. a. unlimited b. renewable c. available d. non-renewable 5. Many newer cars have a much lower fuel ______. a. consuming b. consumer c. consumation d. consumption 6. Increased consumption will lead to faster ...... of our natural resources. a. exhaust b. exhausting c. exhaustion d. exhaustive 7. ...... energy sources include water and wind power. a. Friendly environmental b. Environmentally friendly c. Friendly environment d. Environmental friendly