Roughly 71 percent of Earth's<span> surface is covered by </span>water<span>, most of it in the oceans. About a fifth of </span>Earth's<span> atmosphere is made up of oxygen, produced by plants. While scientists have been studying our planet for centuries, much has been learned in recent decades by studying pictures of </span>Earth<span> from </span><span>space. Hope that helps :)</span>
The frequency of volcanic activity, is used to clasify volcanic mountains either as active, dormant or extinct.
Answer:
Dominique
Explanation:
A watershed describes an area of land that contains a common set of streams and rivers that all drain into a single larger body of water, such as a larger river, a lake or an ocean. For example, the Mississippi River watershed is an enormous watershed. Small watersheds are usually part of larger watersheds.
Answer:
separate states, provinces, or countries from one another.
Explanation:
