1. friction causes it photosynthesis 2. from chemical reactions collision 3. change transformation 4. force x distance moved engines 5. changes light energy to chemical energy caused by mixture of chemicals 6. changes chemical energy to heat energy ignite 7. use heat to perform work work 8. reaction chemical energy 9. begin burning heat energy 10. bumping together food

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your welcome.

the first question's answer is a.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.