Over time, the canyons of the Colorado Plateau will . A.
become much colder
B.
lose all their moisture
C.
form tall mountains
D.
fill in with eroded material

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

Northeastern china, north korea, northern japan containing coniferous forests, temperate grasslands, and agriculture, are all part of what climate zone? a. tropical desertb. desertc. humid subtropicald. humid continental

The point where two air masses meet is called a