Blog

In the whole Earth, the four most common elements (by mass) are oxygen, silicon, magnesium, and ________.

Of the ~4,000 known minerals, the vast majority ________.

Comets are primarily a mixture of ________.

If the lithology and fossil content of two bodies of rock on opposite sides of a canyon are identical, then these remaining outcrops were likely physically connected at one time and formed part of an extensive, sheet-like layer of rock. This idea summarizes the principle of ________.

Of the three primary compositional layers of the Earth (crust, mantle, core), which is the thickest layer?

Swamps, channels, floodplains, and submarine slopes all play a role in the development of ________.

Glacial till is composed of ________-sized particles.

Topography dominated by depressions formed by the collapse of caves is termed a ________.

According to the figure below, approximately how much has the sea level risen since the last ice age ended, approximately 16,000 years ago?

Why is a spring tide so much higher than a normal high tide?