Small changes in temperature can determine whether snowpack melts and whether precipitation falls as rain or snow.

A natural process that results from accumulation of nutrients in lakes or other bodies of water describe the process of eutrophication.

The main global wind systems include the Trade Winds, Westerlies, and Polar Easterlies. Trade Winds blow steadily from the east toward the equator and are found between 30° north and south latitudes. Westerlies blow from the west toward the poles, occurring between 30° and 60° latitudes, and they influence weather in mid-latitude regions. Polar Easterlies are cold, dry winds that blow from the east near the poles, between 60° and 90° latitudes. These wind systems result from Earth’s rotation and uneven heating, shaping global climate and weather patterns.

The lake must have a source of water that is greater than the outflow and evaporation. It must be on earth that does not allow too much water to infiltrate.

Icecaps and glaciers are the greatest source of freshwater on earth.

The two characteristics of thunderstorms that lead to hail formation are: Water droplets exist in the liquid state in the parts of the cloud where it is below freezing then the water droplets stick to the ice pellets and cause them to grow.