0
What else can I help you with?
In what way is the lower crust different from the upper crust?
The lower crust is denser and more mafic in composition compared to the upper crust, which is less dense and more felsic. The lower crust is also usually deeper in the Earth's crust compared to the upper crust.
If continental crust were thinner than its average thickness of 40km would it depress the mantle more or less than it does now?
If continental crust were thinner than its average thickness of 40km, it would depress the mantle less than it does now. This is because less mass in the thinner crust would exert less pressure on the mantle, resulting in less depression.
Why would a certain thickness of continental crust displace less of the mantle than the same thickness of oceanic crust?
Continental crust is less dense than oceanic crust, so it floats higher on the mantle. This means that the same thickness of continental crust will displace less mantle compared to oceanic crust. Additionally, continental crust is composed of lighter rocks like granites, while oceanic crust is made of denser rocks like basalt.
True or false continental crust is made of rocks such as granite?
True. Continental crust is primarily composed of lighter rocks such as granite, which are less dense than the basaltic rocks found in oceanic crust. This is why continental crust is thicker and less dense than oceanic crust.
What are 2 kinds of crust?
crust on a pizza (thin & thick) or the earth's crust
Is it true that deeper the rock is buried there is less pressure in the rock?
No, the deeper a rock is buried, the more pressure it experiences due to the weight of overlying rocks pressing down on it. This increased pressure can lead to the formation of metamorphic rocks through processes like recrystallization and deformation.
In what way is the lower crust different from the upper crust?
The lower crust is denser and more mafic in composition compared to the upper crust, which is less dense and more felsic. The lower crust is also usually deeper in the Earth's crust compared to the upper crust.
As ocean depth increases?
As wer gets deeper there is less oxygen and it gets colder.
If continental crust were thinner than its average thickness of 40km would it depress the mantle more or less than it does now?
If continental crust were thinner than its average thickness of 40km, it would depress the mantle less than it does now. This is because less mass in the thinner crust would exert less pressure on the mantle, resulting in less depression.
The mantle has less aluminum and less what than the crust does?
The mantle has less aluminum and less silicon than the crust does.
Why would the pressure decrease from the core to the crust of Earth?
There is less weight pressing down from above as the distance toward the surface decreases.
About 90 percent of continental earthquakes have a shallow?
focus, occurring within the top 50 kilometers of the Earth's crust. This is due to the brittle nature of the upper crust, which is more prone to fracturing. Deeper earthquakes also occur but are relatively less frequent.
Why it is difficult to breathe in deep ocean?
It is difficult to breathe in deep oceans because the water pressure increases as you go deeper, making it harder for your lungs to expand and contract properly. Additionally, there is less oxygen available in deep ocean water due to lower levels of photosynthesis and mixing of surface layers with deeper waters.
Why does oceanic crust melt?
At mid-ocean ridges, such as the Atlantic Rise and Pacific Rise. As two plates move apart the crust is stretched and thinned, causing less pressure on the mantle immediately below. Due to this drop in pressure the mantle undergoes "decompressional melting" allowing magma to form. This magma is less dense than the surrounding mantle and rises at the mid-ocean ridges, cooling and forming new oceanic crust.
Why does the continental crust float higher on the athenosphere than oceanic crust?
The continental crust is less dense and thicker than oceanic crust, allowing it to float higher on the asthenosphere. This is because the continental crust is composed of less dense rock types like granite, while the oceanic crust is made up of denser basalt. As a result, the less dense continental crust floats higher due to its lower density and greater thickness compared to oceanic crust.
Why would a certain thickness of continental crust displace less of the mantle than the same thickness of oceanic crust?
Continental crust is less dense than oceanic crust, so it floats higher on the mantle. This means that the same thickness of continental crust will displace less mantle compared to oceanic crust. Additionally, continental crust is composed of lighter rocks like granites, while oceanic crust is made of denser rocks like basalt.
Why does magma in the mantle rise through the crust above it?
magma comes from the outer core and when an earthquake or something happends, a crack froms and the pressure of lava shoots up like a geyser.
