Which of the following describes how Marie Tharp and Bruce Heezen found evidence that led to the theory of plate tectonics?

Question

(1 point)
• They mapped the structures on the ocean floor using a video recording to collect data.
• They observed that the continents seem to fit together like a puzzle.
• They mapped the structures on the ocean floor using sonar rays to collect data.
• They observed two tectonic plates moving away from each other.

Answer 1

Marie Tharp and Bruce Heezen found evidence that led to the theory of plate tectonics by mapping the structures on the ocean floor using sonar rays to collect data. They created detailed maps that revealed the presence of a continuous global mid-ocean ridge system, which included the Mid-Atlantic Ridge, and discovered the deep oceanic trenches and rift valleys, which were crucial in the development of the theory of plate tectonics. The discovery of these underwater features contributed to the understanding that the Earth's lithosphere is divided into plates that move over the asthenosphere.

Answer 2

Whats the correct answer

Answer 3

The correct answer is:

• They mapped the structures on the ocean floor using sonar rays to collect data.

Answer 4

What types of structures form at divergent boundaries? Select the two correct answers. (1 point)
• Ridges
• Volcanoes
• Faults
• Trenches
• Cracks

Answer 5

At divergent boundaries, where tectonic plates are moving away from each other, the following types of structures commonly form:

• Ridges
• Volcanoes

Ridges, such as the Mid-Atlantic Ridge, are formed as magma rises from beneath the Earth's crust to fill the space created by the separating plates. This process can also lead to volcanic activity, and new oceanic crust is formed here. Faults and cracks can be associated with divergent boundaries but are not as uniquely characteristic as ridges and volcanoes are. Trenches are typically associated with convergent boundaries, where one tectonic plate is subducting beneath another.

Answer 6

Why can volcanoes form at convergent boundaries? (1 point)
• Due to plates smashing together, the crust cracks and starts falling apart.
• Due to plates smashing into each other, the crust folds upward.
• Due to subduction, magma shoots out of the crust.
• Due to subduction, a great height difference occurs on the sea floor.

Answer 7

Volcanoes can form at convergent boundaries due to subduction. When two tectonic plates collide, and one plate is forced beneath the other into the mantle, the subducting plate begins to melt due to the high temperatures and pressures in the mantle. This process creates magma, which can rise through the overlying crust to form volcanoes. Therefore, the correct answer is:

• Due to subduction, magma shoots out of the crust.

Answer 8

Two plates slide past each other, causing the crust of each plate to start falling apart. Soon, a crack forms between the two plates.
Which type of boundary is the statement describing?
(1 point)
• Convergent boundary
• Trench boundary
• Divergent boundary
• Transform boundary

Answer 9

The statement describes a transform boundary. At a transform boundary, two plates slide past each other horizontally. The friction and stress along the boundary can cause earthquakes and the formation of cracks or faults, but they do not typically involve the crust falling apart in the same way that occurs at divergent boundaries, where new crust is created as the plates move apart.

So, the correct answer is:

• Transform boundary