Wegener saw Pangaea as a jigsaw puzzle, where the puzzle pieces were ________.

Minerals that do not possess cleavage are said to possess ________.

As compared to aphanitic igneous rocks, phaneritic rocks are ________.

Ore minerals, such as galena and hematite, tend to be different from typical minerals in that they have a ________.

In Bowen’s discontinuous reaction series, the first mineral to crystallize from a mafic melt is ________.

Most of the pulling force driving plate motion is produced ________.

Aside from Earth, the terrestrial planets are ________.

The metal alloy that makes up the core of Earth is ________, as compared to the rocky mantle.

A volcano emits ash, which falls from the sky, settles in layers, and is eventually cemented. The resulting rock is termed ________.

Hot spots can occur ________.