How much of the united states’ electric generation comes from coal? a. about 25% b. about 50% c. about 75% d. about 90%

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

How did the lab activities you answer the lesson question: what effect does plate movement have on geologic events and structures at earth’s surface? what did you learn from conducting this lab?

Suggest two reasons why irrigation is important for human development of the desert (4 marks)