What rock unit would be exposed at the surface if the Colorado River had not created the Grand Canyon

What does the word submerged mean in the following sentence? after it rained for three days in a row, the streets were completely submerged.

Using complete sentences, explain the differences between a command economy and a market economy. what type of economic system is created when these two systems are combined? what are the benefits of combining these two systems?

Some fossils provide evidence to suggest that earth's climate has changed over time. which information can scientists obtain from these fossils? check all that apply