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.
How does seafloor crust differ from the 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.
What is ozone How does the absence of ozone on Venus and Mars explain why these planets lack a stratosphere?
How does the absence of ozone on Venus and Mars explain why these planets lack a stratosphere? Ozone (O3) are molecules that are particularly good at absorbing ultraviolet photons. Because earth is the only terrestrial planet with oxygen, other planets cannot have an ozone, and thus cannot have a stratosphere.
What drives the motion of the continental plates on Earth quizlet?
Earth's lithosphere is broken up into plates that float on the underlying mantle. The tops of the mantle's convection cells drag the bottoms of the plates, making them move. This movement causes spreading in some places and subduction in others.
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 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).
Why are there fewer large impact craters on Earth’s 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 are two differences between oceanic crust and continental crust quizlet?
The oceanic crust is thinner and denser, and is similar in composition to basalt (Si, O, Ca, Mg, and Fe). The continental crust is thicker and less dense, and is similar to granite in composition (Si, O, Al, K, and Na).
What are three differences between oceanic and continental crust?
Difference Between Oceanic and Continental Crust The oceanic crust is mainly made out of dark basalt rocks that are rich in minerals and substances like silicon and magnesium. By contrast, the continental crust is made up of light-colored granite rocks full of substances like oxygen and silicon.
Why does the burning of fossil fuels increase the greenhouse effect on Earth?
When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, causing global warming. Already the average global temperature has increased by 1C.
How does the greenhouse effect on Venus differ from the greenhouse effect on Mars?
As a complete contrast to Venus, there is Mars. The Red Planet displays hardly any greenhouse effect. Mars does have some atmospheric carbon dioxide, but almost no atmosphere! The existing atmosphere is so thin that it cannot retain energy from the Sun.
What theory explains how the plates of the earth are continually moving?
The theory of plate tectonics revolutionized the earth sciences by explaining how the movement of geologic plates causes mountain building, volcanoes, and earthquakes.
What causes Earth’s tectonic plates to move?
The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth's mantle and fit snugly against one another. The heat from radioactive processes within the planet's interior causes the plates to move, sometimes toward and sometimes away from each other.
Why is continental crust lower in density?
Continental crust is less dense because of its composition. Continental crust is made up of felsic material (SiO4)– mainly granite. The density of continental crust is 2.9 g/cm^3. Oceanic crust, while thinner, is made of mafic materials (Fe, Mg)– mainly basalt.
Why are there fewer large craters on the 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 difference between continental crust plates and oceanic plates?
1. The oceanic crust is made up of basalt while the continental crust is made up of granite. 2. The oceanic crust is thinner while the continental crust is much thicker.
What are the differences between oceanic and continental plates?
Oceanic plates are mafic in nature, composed of basalt rock and its coarse-grained equivalent, gabbro, both rich in iron, magnesium and calcium. In contrast, continental plates are felsic in nature, dominated by granitic rock with its abundant silica, aluminum, sodium and potassium.
Which two geological processes have been most important in shaping the surface of the Moon as we see it today?
The primary geologic processes that shaped the moon are the formation of craters, volcanic activity, and tectonic activity. Each of these will be dealt with in their respective sections below. Craters cover the surface of the moon. They are the result of high velocity impacts on the surface by meteorites.
What are the two geological features that appear to set Earth apart from other terrestrial worlds in our solar system?
What are the two geological features that appear to set Earth apart from all the other terrestrial worlds? Plate tectonics and widespread erosion. neither of these features appears to exist on any terrestrial world in our solar system.
What are two differences between oceanic crust and continental crust?
1. The oceanic crust is made up of basalt while the continental crust is made up of granite. 2. The oceanic crust is thinner while the continental crust is much thicker.
How are the oceanic and continental crust similar and different?
Continental crust is typically 40 km (25 miles) thick, while oceanic crust is much thinner, averaging about 6 km (4 miles) in thickness. The effect of the different densities of lithospheric rock can be seen in the different average elevations of continental and oceanic crust.
What is the difference between oceanic and continental plate?
Continental plates have a lower density than Oceanic plates. Granite and recycled materials are much thinner than the ocean plates' thick basalt layers. Oceanic plates occupy about 71% of the Earth's surface. Continental plates make up 29% of the Earth's surface.
What percentage of carbon emissions come from cars worldwide?
The global transportation sector is a major polluter and in 2020 produced approximately 7.3 billion metric tons of carbon dioxide (CO2) emissions. Passenger cars were the biggest source of emissions that year, accounting for 41 percent of global transportation emissions.
How is carbon dioxide produced in a cement plant?
Carbon dioxide is emitted as a by-product of clinker production, an intermediate product in cement manufacture, in which calcium carbonate (CaCO3) is calcinated and converted to lime (CaO), the primary component of cement. CO2 is also emitted during cement production by fossil fuel combustion.
Is sulfur dioxide a greenhouse gas?
Sulfur dioxide is not considered a direct greenhouse gas because sulfur dioxide does not absorb and trap infrared radiation as it attempts to return…
How greenhouse gases increase the surface temperature of a planet?
The added greenhouse gases absorb the heat. They then radiate this heat. Some of the heat will head away from the Earth, some of it will be absorbed by another greenhouse gas molecule, and some of it will wind up back at the planet's surface again. With more greenhouse gases, heat will stick around, warming the planet.
What is the difference between continental drift and plate tectonics?
The main difference between plate tectonics and continental drift is that plate tectonics describes the features and movement of Earth's surface in the present and in the past whereas continental drift describes the drifting of Earth's continents on the ocean bed.
What does the theory of plate tectonics explain that continental drift theory could not explain?
Plate tectonics explains why Earth's continents are moving; the theory of continental drift did not provide an explanation. Therefore, the theory of plate tectonics is more complete. It has gained widespread acceptance among scientists.
How does convection affect the formation of mountains and the temperature in the surface?
Convection currents carry heat from the lower mantle and core to the lithosphere. … As tectonic plates slowly move away from each other heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises often forming a mountain or elevated area of the seafloor.
How is convection of heat in the mantle related to the movement of lithospheric plates over the asthenosphere?
Heat from deep within Earth is thought to keep the asthenosphere malleable, lubricating the undersides of Earth's tectonic plates and allowing them to move. Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.