(1) Earth's crust is made up of relatively rigid plates that ride atop Earth's hot, semiliquid mantle. (2) The plates are called
tectonic because they're in constant motion. (3) They can move because Earth's mantle is a very hot and semiliquid fluid called magma. (4) Volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) Also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) Therefore, we often find volcanoes and earthquakes along plate boundaries. (7) Plates may also collide. (8) When that happens, mountain ranges are formed. (9) For example, the collision of the plate carrying the Indian subcontinent created the Himalayan Mountains when it collided with the Asian plate. A. Sentence 6
B. Sentence 7
C. Sentence 4
D. Sentence 5
isolationist is a person who believes in keeping to one's own affairs rather than becoming involved in the affairs of others. A person who believes that the United States should mind its own business and not interfere with things going on in other countries is an example of an isolationist.
When Columbus arrived on Cuba, Hispaniola and other islands in the Caribbean he instituted shockingly cruel and genocidal policies which rapidly decimated the populations of indigenous Arawak Indians. He was also a slave trader, and his own words condemn him
