<span>Much of the commercially important waterways of the United States consist of the Mississippi River System—the Mississippi River and connecting waterways. .... States on the Gulf Coast and throughout the Midwest and Ohio Valley ...</span>
D is the best and correct answer....!.!.!.!.!.!.!.
It would refer to a number of related phenomena and patterns of change.
Answer:
a. True.
b. False.
c. True.
d. True.
Explanation:
A landform refers to a geomorphic or natural feature of the Earth's surface, which typically makes its terrain. Some examples of landforms on planet earth are mountain, plains, volcanoes, valley, hills and plateau.
Basically, the tectonic plates such as the oceanic and continental lithosphere interact in three (3) ways and these are; divergent, transform and convergent boundaries.
a. Plates shift the continents around as they move, so Earth's surface is constantly changing.
b. False: the contacts between plates are called passive margins. A passive margin is a region where continents have rifted apart and are then separated by a body of water such as an ocean.
c. True: plates may consist of both ocean floor and continental crust, but never just oceanic or continental crust.
d. True: there are 120 major tectonic plates.
