A ________ is a semiarid, transitional region.

For a radioactive isotope like Uranium-235, what does the 235 indicate?

A sand ridge connecting an island to the mainland or to another island is a ________.

A ________ is a semiarid, transitional region.

Which of the following refers to the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

Which best explains the demise of the Farallon Plate?

________ is the maximum possible damage designation on the Mercalli scale.

Which one of the following shows the correct order (left to right) of decreasing magma viscosity?

A ________ is a crescent-shaped dune whose tips point downwind.

The majority of Atlantic hurricanes occur ________.