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Geophysics

The study of Earth using the combination of Geology and Physics, it lets us understand what is going on under the Earth's surface. Find questions on different types of seismic activities such as earthquakes and volcano eruptions here.

1,480 Questions

Ways sedimentary rocks can form?

The key word here is 'form'. Sedimentary rocks can be broken down into three informal groups. The first group is known as siliciclastic, or just as clastics and these include rocks like sandstone, shale, and conglomerates. These rocks are transported and deposited by water, wind, or gravity. Eventually when they are buried under enough pressure they will become lithified by diagenesis. That is a process that 'cements' them together. They are also described as allocthonous, meaning they originated in a different place from where they were deposited.

The second informal group of sedimentary rocks are carbonates. Carbonates include limestone and dolomite. These rocks are mostly built by living organisms. Shells from marine organisms, corals, and many algaes all form carbonate rocks. Some but not all carbonates are autochthonous, meaning they originated in the place they were found. Carbonate rocks often form as rock quite quickly and undergo various stages of later diagenesis. The key thing to remember about carbonate rocks is they were "born" and not just transported like clastics. Most carbonates are formed in the ocean.

The third informal group of sedimentary rocks are called chemical sedimentary rocks. These form by evaporation or precipitation from water, so at some point they were completely dissolved. Examples of this type of rock are gypsum, halite (sodium chloride salt), and sylvite (potassium chloride salt). These rocks can form under certain ocean conditions or in places like dry lakes where the evaporation leaves them behind.

What are the stages in a continental drift?

Well, Continental Rifting is the process in which a continent is literally pulled apart. First, sediment collects on the floor of the rift valley. Oceanic crust made of gabbro and basalt is formed, which is dense and causes the valley to sink. Eventually, ocean water flows into the valley. There you have it. Hope this Helped.

What external forces cause changes in the earth's surface?

I think denudation is one of the external forces that causes changes in the earth's surface. Denudation refers to the removal of rock material from the surface of the earth through the process of weathering and erosion.

How are mesas formed?

Mesas are formed through a combination of geological processes such as erosion, sedimentation, and uplift. The flat top of a mesa is the result of horizontal layers of sedimentary rock that have been uplifted, while the steep sides are shaped by erosion from water and wind. Over time, differential erosion wears away the softer rock layers, leaving behind the characteristic flat-topped plateau.

Why is Mount Pinatubo considered a danger zone?

Mount Pinatubo is considered a danger zone because it is an active volcano that has the potential to erupt explosively, causing widespread destruction in the surrounding areas. It has a history of violent eruptions, such as the 1991 eruption, which was one of the largest in the 20th century. The area around the volcano is densely populated, making it imperative to monitor any volcanic activity closely to ensure the safety of nearby communities.

What is the name of the submersible that decended to the bottom of the challenger deep the deepest spot on earth?

The submersible that descended to the bottom of the Challenger Deep, the deepest spot on Earth, is called the Deepsea Challenger. It completed the historic dive in 2012 with filmmaker James Cameron aboard, reaching a depth of about 10,908 meters (35,787 feet).

What is radiation heat?

Radiate heat is ENERGY TRANSFER at a distance FROM ONE OBJECT

to ANOTHER OBJECT through a form of

1. heat conduction through a medium.

2. heat waves (a variety of light waves) in the Infrared region of light

3. Energy transfer with a transfer agent.

The object that heat is being radiated TO (the target),

then rises in temperature, due to the transfer of energy.

Is shale resistant to erosion?

Shale is generally more resistant to erosion compared to other rock types like sandstone due to its fine-grained nature and ability to compact tightly. However, shale can still erode over time through processes such as weathering, rainfall, and freeze-thaw cycles.

Rock that forms from other rock due to heat and pressure beneath earths surface?

Metamorphic rock forms when existing rock is subjected to high temperatures and pressures below the Earth's surface. This causes the mineral composition and texture of the rock to change, resulting in the formation of new types of rock such as marble, schist, or gneiss.

Why did Wagener's theory of continental drift not accepted?

Alfred Wegener's theory of continental drift was not initially accepted because he lacked a mechanism to explain how continents could move. Additionally, his evidence was considered insufficient and geologists at that time did not believe that continents could drift over time. It was not until the theory of plate tectonics was developed in the 1960s that Wegener's ideas gained widespread acceptance.

Which of the elements are among the most abundant in Earth's crust?

The Earth's crust consists of the following elements and percentages: # Oxygen--47% # Silicon--28% # Aluminum--8% # Iron--5% # Calcium--4% # Sodium--3% # Potassium--3% # Magnesium--2% # Titanium--0.5% # All others--<1%

What are the spheres of the earth?

The 5 spheres on the Earth are;

1. Biosphere.

2. Atmosphere.

3. Lithosphere.

4. Hydrosphere.

5. Cryosphere.

What is a geyser?

A geyser is a natural phenomenon that features a gushing fountain of water and/or steam being emitted from a hole in the ground. Such eruptions often occur on a periodic basis. "Old Faithful," located in Yellowstone National Park in Wyoming, USA, is probably the most famous geyser on earth, but it is only one of over 500 active geysers in that park. Yellowstone holds roughly half of the active geysers known in the world.

Essentially, a geyser is formed when three ingredients come together in one place -- subterranean water, usually under pressure, magma, subterranean but close to the surface, and a "plumbing" structure to convey the steam and hot water to the surface. The water hits the magma, steam-driven pressure is formed, and the "plumbing" system carries the blast to the surface.

Name of the fault type of fault description of how far the fault runs of Mt. St. Helens?

The fault type is a normal fault, called the Spirit Lake Fault, and it runs approximately 9 miles to the north of Mount St. Helens.

How Wegener try to prove the theory of continental drift?

Alfred Wegener proposed the theory of continental drift in 1912. He collected evidence from various fields, such as the fit of continental coastlines, matching rock types and structures across continents, and similar fossil distributions. However, his theory was not widely accepted until decades later when the concept of plate tectonics provided a mechanism for how continents could move.

Evidence for continental drift?

Evidence for continental drift includes matching geological formations on different continents, such as mountain ranges and sedimentary layers. Additionally, the fit of the continents like puzzle pieces, similarities in fossil records on separate continents, and matching glacial evidence provide support for the theory. Paleoclimatic evidence, such as the distribution of ancient flora and fauna, also contributes to the case for continental drift.

Second most abundant element in earth's crust?

silicon

silicon's atomic mass is 28.06 and it has 14 protons so it would have 14.06 neutrons on average

What is Archie Carr's contribution to continental drift?

Archie Carr's proposing theory that as Brazil spread away from the Mid-Atlantic ridge and Ascension Island, the green turtle returned to the island year after year to lay eggs. The hatchlings would have to swim back further each time 2cm/yr until today when they swim back 1200 miles. I believe this to support Wegener's theory.

If you dig deep in the ground do you get hot rocks or water?

It depends, of course, in where you dig. You are probably going to hit both, but in what order and at what depth is dependent on the location. Hot rocks and water can both be found on the surface.

How are Sedimantary Rocks Formed?

Sedimentary rocks are formed through the accumulation and compression of sediments, such as sand, silt, and mud, over long periods of time. These sediments are deposited in layers and become compacted and cemented together, creating sedimentary rocks. The process typically involves pressure, temperature, and the presence of water to facilitate the transformation of loose sediments into solid rock.

What tools do scientists use?

what tools arte generally used for rocket science

The man who pioneered the continental drift hypothesis was?

The man who pioneered the continental drift hypothesis was Alfred Wegener. He proposed the theory in 1912, suggesting that Earth's continents were once joined together in a single landmass called Pangea and have since drifted apart.

What are some examples of plasma?

Some examples of plasma include lightning, neon signs, plasma TVs, and the sun. Plasma is the fourth state of matter, consisting of ionized gases with charged particles. It is often found in high-energy environments.