Quiz 11

The Precambrian Eon encompasses what percentage of Earth's total history?

87.6

What percent of the Earth's crust is composed of only eight natural elements?

99

Which of the following is incorrect regarding the Earth's inner core?

It is the source of Earth's magnetic field

The Hawaiian Islands were formed as a result of

a rising plume of magma from the mantle

Which of the following is true of the asthenosphere?

all of the above are true

Plate boundaries are associated with

all of the above: earthquakes, volcanoes, subduction, rifting

At which of the following locations is new ocean crust being formed?

along collision zones between two continents

The largest type of pluton is a

batholith

Convergent plate boundaries are characteristic of

collision zones between plates

Which of the following gives the correct sequence of layers in the Earth, from the surface to the center?

crust, asthenosphere, lower mantle, core

Which of the following lists the correct sequence of divisions in the geologic time scale, from largest to smallest?

eon, era, period, epoch

Continental crust is basically_______, whereas oceanic crust is basically____.

granite, basalt

Knowledge of Earth's interior is derived from

indirect evidence involving the analysis of seismic waves

The magma, which fuels and produces the volcanic activity around the Pacific Ring of Fire, is derived from the

rise of material that was melted in subduction zones along the Pacific margins.

Three types of rock-forming processes comprise the

rock cycle

Ocean floor subducts under continents because

the ocean floor is made of mafic material and is therefore more dense than continental material

The ocean floor is a maximum of about 200 million years in age because

the ocean floor subducts during plate collisions.

An element or combination of elements that forms an inorganic, natural compound is called a

mineral

Which of the following layers of the Earth is liquid and is responsible for producing the Earth's magnetic field?

outer core

The three most abundant elements in Earth's crust are

oxygen, silicon, and aluminum