Trace gases in the atmosphere are not as abundant as nitrogen or oxygen are. However, they play a part in making Earth's atmosphere one in which life can live. What do trace gases do in Earth's atmosphere?
O A. create the greenhouse effect by adding additional carbon dioxide
OB. allow water vapor to remain in the atmosphere
C. trap solar energy before it escapes to help Insulate Earth
D. Suspend smoke and small particles in the atmosphere

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.