Exam 12: The Dynamic Planet

Scientists have direct evidence of the Earth's internal structure down to upper mantle.

The uneven transition zone from the outer core to the mantle is known as the ________ discontinuity.

Mid-ocean ridges occur where

The dominant element in oceanic crust are

Which of the following are located along the midocean ridges?

The last pole reversal occurred ________ years ago and, based on magnetic field decay, we are approximately ________ years from entering the next phase.

The three most abundant elements in Earth's crust are

Divergent plate boundaries are characteristic of

Convergent plate boundaries are characteristic of

Contact metamorphism involves changes in the texture and minerology of a rock caused by the extreme heat and pressure of intruding magma.

The density of material below the Moho is ________ that above it.

The principle of isostasy refers to the vertical movement of Earth's crust in response to loading and unloading of weight, such as ice or sediment.

Metamorphism that occurs when rocks are exposed to the pressure and extreme temperature associated with intruding magma is known as

The continuous alteration of Earth materials from one rock type to another is known as the

Which of the following is not correct?

The principle that the same physical processes currently active in the environment were operating throughout Earth's history is known as

Which of the following is correct regarding the geologic time scale?

Describe the endogenic and exogenic processes involved in the geologic cycle.

The crust is thickest under mountains and thinnest under the oceans.

Humans can contribute to both the endogenic and exogenic processes shape the Earth.