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

What were the damages and responses of hurricane isabel

How has the geography of india made it difficult for its people to expand before modern technology?

Which statements describe sustainable development? multiple answer choice -fishing does not remove more fish from water systems than can be replaced by the number of fish that will be born to replace them. -sustainable development is development that is designed to improve the economic conditions in less-developed countries. -sustainable development is mainly a regional issue. -sustainable development means water is used at a rate that won't reduce the amount available for future use. - sustainable development policies only need to be concerned with environmental protection. - trees cannot be cut down faster than the number that will be replaced by new growth.