After the Big Bang occurred, scientists think that the universe. A) Started to expand.

B) Grew less dense.

C) Began to cool.

D) All of these.

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

An earthquake’s epicenter can be determined from arrival time data recorded on a(

How did the korean war impact the elections of 1952?