Why do scientist think that lithosphere has to be destroyed somewhere on or in the earth?

Why do scientists think that lithosphere has to be destroyed somewhere on or in the earth? Lithosphere is created at divergent boundaries and the earth is not getting any larger.

What was never proposed as evidence supporting the existence of Pangaea?

Because Wegener could not identify a mechanism capable of moving continents. Which of the following was never proposed as evidence supporting the existence of Pangaea? Islands along the Mid-Atlantic Ridge with rocks dating back from 542 million to 2500 million years ago.

What is GPS global positioning system used for in the study of plate tectonics quizlet?

What is GPS (Global Positioning System) used for in the study of plate tectonics? It measures velocity of a plate.

What is considered the most important driving factor for plate tectonics?

Heat is continuously flowing outward from Earth’s interior, and the transfer of heat from the core to the mantle causes convection in the mantle (Figure 1.7). This convection is the primary driving force for the movement of tectonic plates.

What was the main view of how the world worked geologically prior to the 1960s quizlet?

What was the main view how the world worked geologically prior to the 1960s? It was generally believed that mountains were produced by vertical forces.

What was the major problem with Wegener’s theory of continental drift quizlet?

-while he had evidence to support that continents were on the move, he could not explain HOW they moved. – continental drift was a slow process and Wegener could not explain what FORCES caused the continents to move. the mantle below melts and forms magma.

How the Hawaiian island chain provides evidence in support of plate tectonics?

Explain how the Hawaiian Island chain provides evidence in support of Plate Tectonics. The combined processes of magma formation, eruption, and continuous movement of the Pacific Plate over the stationary hot spot have left the trail of volcanoes across the ocean floor that we now call the Hawaiian-Emperor Chain.

What evidence indicated scientists that the continents were once connected?

Wegener found fossil evidence that the continents were once joined. The same type of plant and animal fossils are found on continents that are now widely separated. Wegener suggested that when the organisms were alive, the lands were joined and the organisms were living side-by-side.

What is GPS global positioning system used for in the study of plate tectonics?

The movements of these plates can be measured using GPS. GPS uses a system of satellites to triangulate the position of a receiver anywhere on Earth. By using a network of receivers near plate boundaries, scientists can very accurately determine how the plates behave.

How does the structure of the Earth help us understand plate tectonics?

Structure of the Earth The movements inside the iron core are responsible for the protective magnetic field around the Earth. The rocky mantle comes next, and the upper layer of this rocky mantle is the weak asthenosphere. The asthenosphere aids in plate tectonics on the lithosphere.

When did Wegener presented drift theory?

1912
The first truly detailed and comprehensive theory of continental drift was proposed in 1912 by Alfred Wegener, a German meteorologist. Bringing together a large mass of geologic and paleontological data, Wegener postulated that throughout most of geologic time there was only one continent, which he called Pangea.

What was the major problem with Wegener’s theory of continental drift?

The Problem with the Hypothesis To his colleagues, his greatest problem was that he had no plausible mechanism for how the continents could move through the oceans. Based on his polar experiences, Wegener suggested that the continents were like icebreaking ships plowing through ice sheets.