Homo erectus coexisted with _________ for 500,000 years.

Any lake that forms where meltwater accumulates along a glacier’s margin is called a(n)__________. 

Which of the following are not linear constraints?

During periods of glaciation, sea level rises.

​The Himalayan orogeny is the result of a collision between Africa and Eurasia.

The Universe is __________, meaning that the density __________. Select two and only two answers.  If you select more than two answers, you will receive 0 credit on this question. 

Horns form by the headward erosion of at least ______ cirques.

Valley glaciers are larger in size than continental glaciers.

Long ridges that form perpendicular to prevailing wind direction are called __________ dunes.

Which present-day continent does not have ANY glaciers?