a. Plates shift the continents around as they move, so Earth's surface is constantly changing. b. The contacts between plates are called passive margins. c. Plates may consist of both ocean floor and continental crust, but never just oceanic or continental crust. d. There are 120 major tectonic plates.

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.

the correct answer is amazon river

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.