The presence of Late Paleozoic-age glacier-formed sedimentary rocks in southern Africa, southern South America, India, and Australia suggest that

When two tectonic plates converge, which of the plates is subducted?

Earth’s continents existed largely as separate land masses prior to the existence of the supercontinent, Pangea.

Which of the following major geologic layers is weak and plastic?

If all samples of a material have identical properties and composition, it is

The development of physics since about 1900 is called

An element that tends to los electrons during chemical reactions is probably

The process of melting ice is an example of

Cancer always originates from mutations in a stem cell.

Intrinsic factors causing mutations, such as errors in replication during cell division, are avoidable.