How does seafloor crust differ from continental crust?
Oceanic crust differs from continental crust in several ways: it is thinner, denser, younger, and of different chemical composition. Like continental crust, however, oceanic crust is destroyed in subduction zones. The lavas are generally of two types: pillow lavas and sheet flows.
Why are there fewer large impact craters on the earths seafloor than on the continents?
Why are there fewer large impact craters on the Earth's seafloor than on the continents? Seafloor crust is younger than continental crust, so it has had less time in which to suffer impacts.
Why does Earth have the strongest magnetic field among the terrestrial world?
Of the 4, only Earth has a sufficiently large molten iron core for rotation and convection to provide our strong magnetic field.
What is the fundamental reason that Mars has so little geological activity compared to Earth?
What's the fundamental reason that Mars, unlike the Earth, has become virtually geologically dead? Its small size compared to Earth. Small size leads to less volcanic outgassing and greater atmospheric loss.
Why is oceanic crust denser than continental?
Bassically the Oceanic crust is made with volcanic rocks and intrussions from the Mantle (which is more dense than the crust) and it has densities of about 2.9 grams/cubic centimeter. Continental crust is about 2.7 gr/cc, becase is made from less dense rocks as granites or limestones.
Why continental and oceanic crusts differ in their density?
Because continental crust is less dense than oceanic crust it floats higher on the mantle, just like a piece of Styrofoam floats higher on water than a piece of wood does. The mantle, oceanic crust and continental crust have different densities because they are made of different kinds of rock with different densities.
Why is Earth’s continental crust lower in density than Seafloor crust quizlet?
Why is continental crust lower in density than seafloor crust? Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it.
Why are the inner planets made of denser materials than the outer planets?
Why are the inner planets made of denser materials than the outer planets? In the inner part of the nebula only metals and rocks were able to condense because of the high temperatures, whereas hydrogen compounds, although more abundant, were only able to condense in the cooler outer regions.
Why does Earth have the strongest magnetic field among the terrestrial world quizlet?
Why does Earth have the strongest magnetic field among the terrestrial worlds? It is the only one that has both a partially molten metallic core and reasonably rapid rotation. Which of the following most likely explains why Venus does not have a strong magnetic field? Its rotation is too slow.
What part of Earth has the strongest magnetic field?
the poles Intensity: The magnetic field also varies in strength over the earth's surface. It is strongest at the poles and weakest at the equator.
Why are terrestrial planets denser than Jovian planets?
The density of terrestrial planets is higher than the Jovian planets because the terrestrial planets are made of dense metals core where the jovian planets are made up of many gases. Thus even though the jovian planets are bigger and heavier than the terrestrial planets, they are less denser.
Why is the continental plate less dense?
Continental plates, on the other hand, are made of rocks similar to granite, like the countertops in your home might be made of. These rocks are less dense, and thus the continental plates are also less dense.
Why is oceanic crust more dense than continental?
Bassically the Oceanic crust is made with volcanic rocks and intrussions from the Mantle (which is more dense than the crust) and it has densities of about 2.9 grams/cubic centimeter. Continental crust is about 2.7 gr/cc, becase is made from less dense rocks as granites or limestones.
Why are oceanic plate denser than continental?
As stated, oceanic plates are denser than continental ones. This is because they are made of denser rocks. Oceanic plates are typically composed of basalt. Basalts are mafic igneous rocks, which means they have a silica (quartz) content of less than 20% and are created by the cooling of lava.
What causes the difference in densities between inner and outer planets?
This is because the outer planets are in a gaseous state while the inner planets are solid and more compact. Consequently, the density of the inner planets is greater than that of the outer planets.
Why are the inner planets made of denser materials while the outer planets contain many less dense volatile compounds?
Why are the inner planets made of denser materials than the outer planets? A) The Sun's gravity pulled denser materials toward the inner part of the solar nebula, while lighter gases escaped more easily.
How does it explain the differences between seafloor and continental crust quizlet?
Seafloor crust is younger than continental crust, so it has had less time in which to suffer impacts. How does seafloor crust differ from continental crust? Seafloor crust is thinner, younger, and higher in density.
What is the main factor that makes Earth more geologically active than the other terrestrial planets?
Internal heat Why is Earth geologically active? Internal heat drives geological activity. – Larger the planet, more heat retained. – Circulation of liquid outer core creates Earth's magnetic field.
Which planet has no magnetic field?
Mercury was thought to be cold and dead inside, thus having no magnetic field.
How many tesla is Earth magnetic field?
0.00005 tesla For comparison, the Earth's magnetic field has a magnetic flux density of about 50 microtesla, or 0.00005 tesla.
Why do Jovian planets have low density?
Despite their size, the Jovian planets have low densities because of their gaseous composition. Saturn, for example, is made of materials lighter than water. If it could be placed in a giant swimming pool, the planet would float. The Jovian planets' colors differ due to their temperature, composition, and cloud height.
Why do the cores of the terrestrial planets have high densities?
Compared to Earth, Mercury is much smaller, which is why it inner regions are subject to less in the way of compression. Therefore, its high density is believed to be the result of a large, and iron-rich core.
Why is ocean crust denser than continental crust?
Bassically the Oceanic crust is made with volcanic rocks and intrussions from the Mantle (which is more dense than the crust) and it has densities of about 2.9 grams/cubic centimeter. Continental crust is about 2.7 gr/cc, becase is made from less dense rocks as granites or limestones.
Why do planets have different densities?
For example, Mercury is almost as dense as Earth, even though it's much smaller. Since a small planet experiences less gravitational compression than a larger planet—that is, the effects of gravity don't squish it down as much—astronomers need to look for another reason for its density.
Why are the inner planets small and dense and the outer planets are gas giants?
The inner planets are much smaller than the outer planets and because of this have relatively low gravity and were not able to attract large amounts of gas to their atmospheres.
Why do you think the inner planets are small and dense while the outer planets are gas giants?
The giant planets are less dense overall because they are made mainly of gases, and the inner rocky planets are more dense because they are made mainly of rock.
Why are the inner planets made of denser materials than the outer planets group of answer choices?
Why are the inner planets made of denser materials than the outer planets? In the inner part of the nebula only metals and rocks were able to condense because of the high temperatures, whereas hydrogen compounds, although more abundant, were only able to condense in the cooler outer regions.
What are the differences between oceanic and continental plates quizlet?
Oceanic plates are mainly found at destrictive plate margins because the oceanic plate subducts (goes under) the continental plate. Continental plates are where there is tectonic plate that are lighter than oceanic tectonic plate(s).
What is the most important factor in determining if a terrestrial planet has liquid surface water?
What is the most important factor in determining if a terrestrial planet has liquid surface water? A planet's distance from the Sun. Why is the Earth's core composed of mostly metals (like iron and nickel)?
Why is the size of the Earth and other terrestrial planets critical in the retention and release of internal heat?
The greater the size, the longer a planet can retain enough internal heat to drive various geological processes (e.g., volcanic outgassing) which build up and maintain a dynamic hydrosphere. A large size (high gravity) also helps a planet retain atmospheric gases and slow down their escape into space.