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.
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.
Which of the following is not generally true of all the terrestrial world Lithospheres group of answer choices?
astronomy final shelley
| Question | Answer |
|---|---|
| Which of the following is not generally true of all the terrestrial world lithospheres? | The lithosphere is broken into a set of large plates that float upon the softer rock below. |
Why is 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. How fast do plates move on Earth? one plate slides under another, returning older crust to the mantle.
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 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. How fast do plates move on Earth? one plate slides under another, returning older crust to the mantle.
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.
What makes us think that Mars in the past must have had an atmosphere that was warmer and had higher surface pressure?
What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure? The atmosphere is too cold and thin for liquid water today, yet we see evidence that water flowed on the surface in the past. Mars lost any global magnetic field that it may once have had.
Why does the Earth have the strongest magnetic field among the terrestrial worlds?
Of the 4, only Earth has a sufficiently large molten iron core for rotation and convection to provide our strong magnetic field.
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 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.
Is continental crust less dense than oceanic?
Continental crust is broadly granitic in composition and, with a density of about 2.7 grams per cubic cm, is somewhat lighter than oceanic crust, which is basaltic (i.e., richer in iron and magnesium than granite) in composition and has a density of about 2.9 to 3 grams per cubic cm.
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.
Who owns Mars planet?
Mars belongs to everybody, according to the Outer Space Treaty, which the United States signed back in 1967. The treaty says nobody can own a celestial body.
Why Mars is red?
Rusty Planet Mars is known as the Red Planet because iron minerals in the Martian soil oxidize, or rust, causing the soil and atmosphere to look red.
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.
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.
Is continental crust less dense than oceanic crust?
The continental crust is also less dense than oceanic crust, although it is considerably thicker. As a consequence of the density difference, when active margins of continental crust meet oceanic crust in subduction zones, the oceanic crust is typically subducted back into the mantle.
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 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.
Why do large planets retain heat longer than smaller planets?
Why do large planets retain internal heat longer than smaller planets? The extra rock on larger planets acts as insulation, so it takes much longer for interior heat to reach the surface. Also, the bigger planets will start out hotter because of a deeper core with higher temperatures and pressure.
Who owns NASA?
That's because NASA isn't a private or publicly-owned company. Instead, it's an official agency of the U.S. government. That means it's technically owned by the United States and receives government funding just like the Department of Justice, Department of Education, National Park Service, etc.
Can I buy a planet?
No, people cannot legally buy planets, at least for now. There isn't any way to legally enforce a claim to a planet, and courts have rejected similar claims in the past. International law forbids countries from claiming any celestial body, meaning a nation cannot grant space real estate to its citizens.
Is the Sun black?
As with all matter, the sun emits a “black body spectrum” that is defined by its surface temperature. A black body spectrum is the continuum of radiation at many different wavelengths that is emitted by any body with a temperature above absolute zero.
Who is the sister of Earth?
Venus As Earth's sister planet, Venus has endured a love-hate relationship when it comes to exploration.
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.
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 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.