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The majority of the rocks that occur at the surface of Earth are ________.

Calcite (CaCO3) is in which mineral class?

The Moho ________.

Trace amounts of impurity in a mineral can commonly produce significant differences in ________ among individual crystals of this mineral.

The image below shows a mineral specimen of quartz. What is the term for the smoothly curving, clamshell-shaped surface on the sample below?

Which earthquake scale measures the amplitude of deflection of a seismograph pen, standardized to an idealized distance of 100 km between the epicenter and the seismograph?

Which of the following would be an area of the ocean with the least dense water?

The image below shows a mineral specimen of pyrite. What is the term for the thin parallel corrugations or stripes shown on the crystal faces below?

Which of these parts of the deep-ocean floor is flat and nearly featureless?

In the geologic past, the polarity of the Earth’s magnetic field is ________.