What keeps the layers of the atmosphere separated?
a. air pressure
b. air composition
c. changes in elevation
d. changes in temperature trends

Awatershed is a piece of land that drains water into a particular stream, lake, or river. which of the following factors often negatively impacts the water quality in a watershed? a.) wetlands b.) pollution c.) irrigation d.)rainfall

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j

Which domain endings indicate websites that are most likely to be reliable sources? check all that apply. sites ending in .net