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 observed that the continents seem to fit together like a puzzle. 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 mapped the structures on the ocean floor using sonar rays to collect data. 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.
Marie Tharp and Bruce Heezen mapped the structures on the ocean floor using sonar rays to collect data. This work was crucial in revealing the presence of the Mid-Atlantic Ridge and the pattern of symmetric seafloor spreading on either side of the ridge, which supported the hypothesis of continental drift and helped lead to the development of the theory of plate tectonics.
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 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 mapped the structures on the ocean floor using a video recording to collect data.
They observed two tectonic plates moving away from each other.
Marie Tharp and Bruce Heezen mapped the structures on the ocean floor using sonar rays to collect data. Their work was instrumental in identifying the Mid-Atlantic Ridge and suggesting the presence of rift valleys and seafloor spreading, which were key pieces of evidence supporting the development of the theory of plate tectonics.
What types of structures form at divergent boundaries? Select the two correct answers. (1 point) Responses Faults Faults Cracks Cracks Volcanoes Volcanoes Trenches Trenches Ridges
At divergent boundaries, the following types of structures typically form:
1. Ridges - These are underwater mountain ranges that form due to the upwelling of magma from beneath the Earth's crust as tectonic plates pull apart. A prime example is the Mid-Atlantic Ridge.
2. Volcanoes - As the plates separate, magma rises to fill the gap, which can lead to the formation of new volcanic activity.
Cracks and faults can also be associated with divergent boundaries but are not the primary structures that are typically highlighted when discussing the features created by such boundaries. Trenches, on the other hand, are typically associated with convergent boundaries, not divergent ones.
Why can volcanoes form at convergent boundaries? (1 point) Responses 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 subduction, magma shoots out of the crust. Due to subduction, magma shoots out of the crust. 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 plates smashing into each other, the crust folds upward.
Volcanoes can form at convergent boundaries due to subduction. When two tectonic plates collide, one of the plates is often forced beneath the other in a process known as subduction. As the subducting plate descends into the Earth's mantle, it begins to melt due to the high temperatures and pressures. This melting generates magma, which is less dense than the surrounding solid rock. The magma then rises through the crust until it reaches the surface, resulting in volcanic eruptions.
Hence, the correct answer is: "Due to subduction, magma shoots out of the crust."