Which of these statements best describes how an increase in the amount of sun’s heat reflected by the earth’s surface and atmosphere contributes to global climate change? it makes the earth warmer. it makes the earth cooler. it increases the sun’s output. it decreases the sun’s output.

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.