The device, created during the 1920s, used to measure ocean depths with sonar was the _______

_______ are deep, steep-sided valleys that are cut into the continental slope.

Among the following radioactive parent isotopes, which is likely to be used for specimens less than 75,000 years old?

At what type of plate boundary do plates move apart from one another?

The type of fossil formed when organisms leave tracks, burrows, or waste is a _______ fossil.

The ________________________ is the concept that ancient life forms evolved in a definite order and their fossils can help determine the geologic ages of strata.

A/n _______ is a depositional landform created where streams emerge from mountain canyons in a valley.

_______ refers to the perfect of the total volume of rock or sediment that consists of pore spaces.

_______ is the tube through which magma rises to the surface in a volcano.

Our greatest source of knowledge about the Earth’s interior comes from ________________.