the diagram below, which represents zones of Earth's interior, identified by letters A through E. The scale shows depths below Earth's surface, measured in kilometers.

Which zone is characterized by partially melted rock and large-scale convection currents?

the map below which shows the locations of deep-sea core drilling sites numbered 1 through 4. The approximate location of the diverging plate at the East Pacific Ridge is shown by a dashed line. Point A is located on the East Pacific Ridge.

At point A, the East Pacific Ridge is the boundary between the

the map below which shows the locations of deep-sea core drilling sites numbered 1 through 4. The approximate location of the diverging plate at the East Pacific Ridge is shown by a dashed line. Point A is located on the East Pacific Ridge.

At which drilling site would the oldest igneous bedrock most likely be found?

the map below which shows the locations of deep-sea core drilling sites numbered 1 through 4. The approximate location of the diverging plate at the East Pacific Ridge is shown by a dashed line. Point A is located on the East Pacific Ridge.

Compared to the thickness and density of the continental crust of South America, the oceanic crust of the Pacific floor is

the cross section below and on your knowledge of Earth science. The cross section represents the distance and age of ocean-floor bedrock found on both sides of the Mid-Atlantic Ridge.

According to the cross section, every 1 million years, the ocean floor bedrock moves approximately

What are the inferred pressure and temperature at the boundary of Earth's stiffer mantle and outer core?

the passage and cross section below and on your knowledge of Earth science. The cross section represents one theory of the movement of rock materials in Earth's dynamic interior. Some mantle plumes that are slowly rising from the boundary between Earth's outer core and stiffer mantle are indicated.

Hot Spots and Mantle Plumes

Research of mantle hot spots indicates that mantle plumes form in a variety of sizes and shapes. These mantle plumes range in diameter from several hundred kilometers to 1000 kilometers. Some plumes rise as blobs rather than in a continuous streak; however, most plumes are long, slender columns of hot rock slowly rising in Earth's stiffer mantle. One theory is that most plumes form at the boundary between the outer core and the stiffer mantle. They may reach Earth's surface in the center of plates or at plate boundaries, producing volcanoes or large domes.

Compared to the surrounding material, mantle plumes rise toward Earth's surface from the core-mantle boundary because they are

the passage and cross section below and on your knowledge of Earth science. The cross section represents one theory of the movement of rock materials in Earth's dynamic interior. Some mantle plumes that are slowly rising from the boundary between Earth's outer core and stiffer mantle are indicated.

Hot Spots and Mantle Plumes

Research of mantle hot spots indicates that mantle plumes form in a variety of sizes and shapes. These mantle plumes range in diameter from several hundred kilometers to 1000 kilometers. Some plumes rise as blobs rather than in a continuous streak; however, most plumes are long, slender columns of hot rock slowly rising in Earth's stiffer mantle. One theory is that most plumes form at the boundary between the outer core and the stiffer mantle. They may reach Earth's surface in the center of plates or at plate boundaries, producing volcanoes or large domes.

At which depth below Earth's surface is the boundary between Earth's outer core and stiffer mantle located?

The photograph below shows the bedrock structure of a limestone outcrop.

Which process is responsible for the deformation of this bedrock?

The photograph below shows the East African Rift Valley in Africa.

Which tectonic movement of Earth's crust is most likely responsible for this feature?

The aerial photograph below shows two streams that have been displaced by tectonic movement along the San Andreas fault. The arrows show the relative direction of movement along the fault.

This movement occurred along which type of plate boundary?

The Hawaiian Islands were formed as a result of

the passage below and on your knowledge of Earth science.Island Arcs

Island arcs are long, curved chains of oceanic islands associated with seismic activity and mountain-building processes at certain plate boundaries. They occur where oceanic tectonic plates collide. Along one side of these island arcs, there is usually a long, narrow deep-sea trench.At island arcs, the denser plate is subducted and is forced into the partially molten mantle under the less dense plate. The islands are composed of the extrusive igneous rocks basalt and andesite. The basalt originates most likely from the plastic mantle. The andesite originates most likely from the melting of parts of the descending plate and sediments that had accumulated on its surface.

An island arc is found along the