Question

1. select the best answer. the __ were once very high mountains but have been eroded over time. appalachian highlands rocky mountains great basin coastal plains 9. select the best answer. the direction a river flows is determined by its location in relation to a . valley lake drainage divide ocean 14. select the best answer. the great lakes are connected to the atlantic ocean by the __.

Explanation:

1. The Appalachian Highlands were once very high mountains but have been eroded over time. The Rocky Mountains are still relatively young and high. The Great Basin is a desert - like region and coastal plains are low - lying areas.
2. The direction a river flows is determined by its location in relation to a drainage divide. Water on one side of a divide flows in one direction and on the other side in another direction. Valleys, lakes, and oceans are not what primarily determine the flow direction of a river.
3. The Great Lakes are connected to the Atlantic Ocean by the St. Lawrence River.

Answer:

1. Appalachian Highlands
2. drainage divide
3. St. Lawrence River