Magma chambers are large pools that hold the lava in a volcano. Lava is the rock that comes out of the volcano during an rupture. The Main Vent is the point where the lava reaches the Earth’s surface. The Crater is the area of the volcano where there is a depression due to the activity of a volcano. Secondary Vents are extra vents that the lava seeped through Secondary Cones are built by lava and are on the volcano.
He suggested that at the centre of oceans, molten material would rise from the Earth’s mantle, causing new sea floor to be created, pushing the ocean floor. He also suggested that there were ocean trenches where old sea floor would then go back into the mantle, and molten. He found that these ocean trenches, the deepest parts of the ocean, were very near continental plates. Hess theorized that the action of the sea floor spreading caused continents to move apart and so this being evidence for continental drift, showing why it happened. The evidence of sea floor spreading was further supported by Vine and Drummond, who studied the magnetic pattern of the sea floor.
What do earthquake swarms indicate? (page 94, para 2 to page 95) Earthquake swarms indicate that new fractures were forming. Swarms can be used as an early indication that magma from a storage zone is being injected into the rifts were these new fractures are happening. 3. What is "summit deflation"?
It was called Panthalassa. 2. Cite the lines of evidence Alfred Wegener used to support his idea of continental drift. Why did scientists doubt that continents drifted? -”Wegner used the shapes of matching shorelines on different continents as a supporting piece of evidence for continental drift.
Plate Tectonics Press Release Assignment Geology/101 An earthquake is the shaking of the ground cause by an abrupt shift of rock along a fracture in the Earth, called a fault. An earthquake is caused by the breaking and shifting of rock beneath the Earth’s surface. Ground shaking from earthquakes can collapse buildings and bridges; disrupt gas, electric, and phone services; and sometimes trigger landslides, avalanches, flash floods, fires, and huge, destructive ocean waves (tsunamis) (www.fema.gov/hazard/earthquake/facts). So the question that everyone wants to know is why does the planet move when the plates move? The planet moves whenever the two plates get tangled together.
c. hot fragments thrown a short distance from the volcano Which of the following volcanoes is generally the largest? c. shield volcano At what depth do gas bubbles have the most effect on magma? c. at very shallow levels, such as within the volcano A lava solidifies into nonvesicular basalt instead of vesicular basalt because: b. the magma has a low content of gas Shield volcanoes commonly have a. fire fountains b. all of the choices c. lava flows d. fissure eruptions Composite volcanoes are so called because they: c. ) are composed of lava flows, pyroclastic material, and mudflows What types of rocks would be most common in a composite volcano? a. felsic and intermediate lava flows and
An example of catastrophism is an earthquake. This is an example of catastrophism because it shows a sudden change. Uniformitarianism is the principle that states the geological processes that happened earlier in history can be explained by the geological processes that are happening gradually today. This principle is what people began to consider shaped the Earth. An example of uniformitarianism is when rock wears away and erodes.
a. Volcano: include the type of lava, where magma is derived, and why this setting produces hazards b. Earthquake: magnitude and amount of displacement or offset 6. Describe the type of hazards in terms of cause, hazard definition, and location (example-tsunami inundation occurred within 1 mile of coastline in low lying areas). 7. Fatalities 8. Damage: 2-3 specific examples of structural damage (earthquakes); areas covered with volcanic debris (volcanic eruption); any other types of damage 9.
The magma that reached the sea bed due to weakness in the crust cooled quickly and formed a layer of basalt above the sediments (see diagram 1). Other magma intrusions
RUNNING HEAD: CONTINENTAL DRIFT DISCUSSION Class Instructor Student The theory of Continental Drift was first hypothesized by Alfred Wegener, a meteorologist and geologist from Germany, was officially disclosed in 1912. Born in Berlin, in the 1880s he was not credited with the discovery until after his death. It was assumed that Continental Drift was impossible because there was no hard evidence to explain how the continents of the world could be separated. It would take a force of great magnitude to cause such an aggressive displacement of land mass. Wegener’s theory called Pangaea or “all earth” (Weil, 1997), proposed that the entire earth had at one time been one huge land mass.