Has impacted the geography of the united states and canada.

the un

mining

the atmosphere

nafta

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Which season occurs in the northern hemisphere when the sun is at its lowest point in the sky

Why did the united states lead a coalition to invade iraq in 1991? o a. there was a fundamentalist revolution in iraq. o b. iraq had invaded iran. o c. an oil embargo had started in the middle east, o d. iraq had invaded kuwait.