Which statement about hail is correct? a. it is rain that falls through a layer of freezing air. b. it may freeze at high elevations many times before falling to the earth. c. it forms in winter in low stratus clouds. d. it is a liquid form of precipitation.

The answer would be B. It may freeze at high elevations many times before falling to the Earth.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.