Why is mercury such a problem in the atmosphere?

What arrow on the map points to an air mass moving toward a cold front

Which macromolecules are polymers made of nucleotides (a) fatty acids (b) nucleic acids (c) carboxylic acids (d) amino acides

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii