Which of the following describes how Marie Tharp and Bruce Heezen found evidence that led to the theory of plate tectonics? (1 point)
Responses
They mapped the structures on the ocean floor using a video recording to collect data.
They mapped the structures on the ocean floor using a video recording to collect data.
They observed two tectonic plates moving away from each other.
They observed two tectonic plates moving away from each other.
They mapped the structures on the ocean floor using sonar rays to collect data.
They mapped the structures on the ocean floor using sonar rays 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.
What types of structures form at divergent boundaries? Select the two correct answers. (1 point)
Responses
Cracks
Cracks
Trenches
Trenches
Faults
Faults
Volcanoes
Volcanoes
Ridges
At divergent boundaries, the following structures can form:
- Ridges
- Rifts or cracks
These are areas where tectonic plates are moving apart, and as a result, magma from the mantle can rise to create new oceanic crust, forming mid-ocean ridges or rift valleys in the case of continental divergence.
Why can volcanoes form at convergent boundaries? (1 point)
Responses
Due to subduction, a great height difference occurs on the sea floor.
Due to subduction, a great height difference occurs on the sea floor.
Due to subduction, magma shoots out of the crust.
Due to subduction, magma shoots out of the crust.
Due to plates smashing together, the crust cracks and starts falling apart.
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 plates smashing into each other, the crust folds upward.
Volcanoes can form at convergent boundaries due to the process of subduction, where one tectonic plate is forced beneath another into the mantle. The subducted plate begins to melt due to the high temperatures and pressures in the Earth's interior. This melting generates magma that is less dense than the surrounding rock, causing it to rise through the overlying crust and potentially leading to volcanic eruptions at the surface. The most accurate response to the question is:
"Due to subduction, magma shoots out of the crust."
While the statement is a simplification and "shoots out" may not accurately describe the gradual movement of magma, this choice conveys the idea that subduction leads to the formation of magma, which can result in volcanism at convergent plate boundaries.
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)
Responses
Trench boundary
Trench boundary
Convergent boundary
Convergent boundary
Divergent boundary
Divergent boundary
Transform boundar
The statement is describing a:
Transform boundary
At a transform boundary, two plates slide past each other horizontally. This can create significant friction and lead to earthquakes along the fault lines where the plates meet. Cracks can indeed form as a result of the stress and deformation caused by the movement.
all of this are correct except cracks pick volcano
I apologize for the confusion. If the presence of cracks must be replaced with the formation of volcanoes in the given statement, then the statement would best describe a:
Convergent boundary
At convergent boundaries, where two plates push against each other, subduction can occur, leading to the melting of subducted material and the creation of magma that can result in the formation of volcanoes.