Which forces were most responsible for the colonialism/imperialism that occurred throughout the 1500s and early 1900s?

What is the main purpose of the gi bill

Soil color only reflects the amount of organic matter present in soil.

Which phrases describe oxygen's roles in earth’s atmosphere? check all that apply. allows fuels to burn forms clouds that produce rain is the gas that animals breathe is used by plants to produce food forms ozone that absorbs the sun's harmful rays