Category: Geology questions

What causes volcanoes to erupt?

Asked by: Sabrina Stepanova The melted rock, or magma, is lighter than the surrounding rock and rises up. This magma collects in magma chambers, but it is still miles below the surface. When enough magma builds up in the magma chamber, it forces its way up to the surface and erupts, often causing volcanic eruptions.

What are the two main geological processes?

Asked by: Michelle Garcia Geologic Processes Weathering – responsible for landslides, subsidence. Erosion – responsible for landslides, subsidence, flooding. What are the major geological processes? The four major geological processes are impact cratering, volcanism, tectonics, and erosion. Earth has experienced many impacts, but most craters have been erased by other processes. We owe the existence

What number on the hardness scale is hematite?

Asked by: Kayla Hartman 5 to 6.5 Alphabetical Mineral Mohs Hardness Hematite 5 to 6.5 Hornblende 5 to 6 Ilmenite 5 to 6 Where is hematite on the hardness scale? about 1 to 6 Hematite ranges in hardness from soft to moderately hard (about 1 to 6 on the Mohs Hardness Scale). Regardless of a

Where was Big Sur landslide?

A 150-foot-stretch of the roadway, located about 15 miles south of the town of Big Sur, completely fell away on Jan. 28 during a mudslide caused by a burn scar. This is far from first time that a landslide has forced the closure of a section of Highway 1 in the Big Sur area, which

Can seafloor spreading cause earthquakes?

Volcanic activity causes the seafloor to spread along oceanic ridges, forming new areas of crust and mantle. After being generated, this new oceanic lithosphere cools down and contracts by up to 3% of its own volume. This contraction can trigger oceanic earthquakes. How does seafloor spreading related to volcanoes? Volcanic activity causes the seafloor to

Why are index fossils important in correlating rock layers?

Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur. Why

What is the Protolith of serpentinite?

Protolith was a Proterozoic-Early Paleozoic upper mantle dunite peridotite that has been multiply metamorphosed during the Devonian, Permian, and Mesozoic. Tightly folded serpentinite from the Tux Alps, Austria. What is the parent rock of serpentinite? Serpentinite Type Metamorphic Rock Miscellaneous May be harder than glass in places Metamorphic Type Hydrothermal Metamorphic Grade Low Grade Parent

Can tsunamis happen in Atlantic Ocean?

Atlantic Ocean Tsunamis: Rare but Possible A tsunami in the Atlantic Ocean is a rare event. Part of the reason for this low incidence of tsunamis is the lack of subduction zones – the most common source of tsunami-causing earthquakes. Why are there no tsunamis in the Atlantic? These subduction zones are both smaller and

What type of plate boundary is near the Alaska Range?

Alaskan tectonics are dominated by Pacific-North American plate interaction. The megathrust boundary between the plates results in both the 4,000-km-long Aleutian Trench and in the arc of active volcanoes that lie subparallel to the trench. What tectonic plates form the boundary near Alaska range? It brought with it fragments of the earth’s crust that fastened

What type of mountains are the Appalachian Mountains?

The Appalachian Mountains, often called the Appalachians, are a system of mountains in eastern to northeastern North America.… Appalachian Mountains Geology Orogeny Taconic, Acadian, Alleghanian Age of rock Ordovician–Permian Are the Appalachians fold mountains? Today, some of the highest peaks of the Appalachians are less than a third of the height of Everest. The crust

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