When we turn on a light switch or use the microwave, we use electricity. What
are common sources of our electricity? Select all that apply.
A. Captured lightning
B. Power plants burning fossil fuels
C. Nuclear power plants
D. Acid in citrus fruits
E. Hydropower plants

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere