Which list properly orders metamorphic rocks from lowest grade to highest grade?

Braided streams ________.

The most recently formed portion of any crystal is always found ________.

Which of the following common minerals is softest?

Deep-oceanic trenches are features of ________ plate boundaries.

Barrier islands are constantly moving in the direction of ________.

Which process removes carbon dioxide from the atmosphere?

Volatile materials can exist as a gas at Earth’s surface. Which of the following is NOT a volatile material?

The best estimate of when the Universe formed is ________.

Compaction and cementation of grains occurs during ________.