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Dissolved gases may comprise up to a few percent by weight of a magma.

Which one of the following statements concerning volcanic blocks and bombs is TRUE?

When did the first abundant fossil evidence appear?

________ is the cool, brittle, outer layer of Earth that includes the crust and uppermost mantle.

You come upon a series of folded sedimentary strata in the field. Which principle can you use to determine that they must have been disturbed after their deposition?

Smooth, rounded cobbles and pebbles are found in streams a result of ________.

Dissolved gases may comprise up to a few percent by weight of a magma.

What is the name for a sedimentary rock composed of a mixture of silt- and clay-sized particles?

Earth’s atmosphere is divided vertically into four layers on the basis of temperature. The layers, in order from bottom to top, are ________.

When did the first abundant fossil evidence appear?