Metamorphic rocks may form from:

Horizon C, the lowest layer in a soil column, has the highest organic content.

Plastic strain occurs when deformed rocks break or fracture as brittle solids.

Punctuated equilibrium is the gradual accumulation of minor changes eventually resulting in the origin of a new species.​

Greenstone belts are some of the youngest rocks on Earth.​

A poorly-sorted sediment might consist of:

Strain is the deformation caused by forces applied to a given area of rock (stress).

The Precambrian represents ______% of geologic time.

The process of one symbiotic organism living within another is called:

The Moon formed after a large object collided with Earth.​