How did the Red Sea shown between Arabia and Africa in this figure form quizlet?
How did the Red Sea, shown between Arabia and Africa in this figure, form? Continental Rifting followed by seafloor spreading. On this figure of a continental collision, which continent would have had subduction-related magmatism before the collision? The continent on the right.
What causes magnetic stripes on the seafloor such as those shown here?
At the mid-ocean ridge spreading axis, these flips in the direction of the Earth's magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
When two oceanic plates converge a curved belt of volcanic islands called an island?
A subduction zone is also generated when two oceanic plates collide — the older plate is forced under the younger one — and it leads to the formation of chains of volcanic islands known as island arcs.
Which of the following parts of the seafloor are the shallowest?
Midocean ridges reach a typical summit elevation of 2,700 meters below sealevel. They are the shallowest major features of the seafloor. Perhaps counter to expectation, the oceans are deeper closer to continents and farthest from midocean ridges.
What type of atom is represented by the small brown sphere in the center of this silica tetrahedron?
45 Cards in this Set
| Which of the following is NOT a mineral? | All of these |
|---|---|
| What type of atom is represented by the small brown sphere in the center of this silica tetrahedron? | silicon |
| The dominant shape in which silicon and oxygen atoms combine in silicate minerals is: | none of these |
What creates magnetic stripes on the seafloor quizlet?
The rock of the ocean floor contains iron. As molten material cooled and hardenend, the iron bits inside lined up in the direction of Earth's magnetic poles, creating a pattern of magnetized stripes.
Why are the mid-ocean ridges higher in elevation than the surrounding ocean floor?
Why are the mid-ocean ridges higher in elevation than the surrounding ocean floor? Warmer material near the ridge is less dense, so floats higher on the mantle.
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain quizlet?
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain? The oceanic lithosphere cools and becomes denser.
How do plate tectonic movement play a significant role to the formation of ocean structure and morphology?
Plate motions cause mountains to rise where plates push together, or converge, and continents to fracture and oceans to form where plates pull apart, or diverge. The continents are embedded in the plates and drift passively with them, which over millions of years results in significant changes in Earth's geography.
When two tectonic plate collide the oceanic crust usually subducts beneath the continental crust because it is?
When an oceanic plate converges with a continental plate, the oceanic crust will always subduct under the continental crust; this is because oceanic crust is naturally denser. Convergent boundaries are commonly associated with larger earthquakes and higher volcanic activity.
How were the elevation of the seafloor?
Seafloor spreading occurs at divergent plate boundaries. 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. Eventually, the crust cracks.
What is trench in geography?
Ocean trenches are long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth. 5 – 12+ Earth Science, Geography, Geology, Physical Geography. Photograph.
Which of the following locations would contain large angular rocks that broke away from bedrock and moved downhill?
2. Steep mountain fronts exhibit large, angular rocks that broke away from bedrock and moved downhill under the influence of gravity.
What class of minerals form when the element Si is bonded with element O as in the mineral quartz?
silicates Quartz falls into a group of minerals called the silicates, all of which contain the elements silicon and oxygen in some proportion. Silicates are by far the most common minerals in Earth's crust and mantle, making up 95% of the crust and 97% of the mantle by most estimates.
How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading quizlet?
How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading? They show when Earth's poles reversed. They show how the density of the seafloor has changed.
How are the magnetic stripes on the oceanic crust formed what is the significance of these stripes in understanding the Earth’s processes?
Since the oceanic crust contains iron in it, the way the rocks on the ocean floor hardened on both sides of the mid-ocean ridges are influenced by the direction of the magnetic field. As a result, it forms a pattern that resembles stripes that are alternately pointed north and south.
Why are oceanic ridges elevated?
Oceanic ridges are elevated as new magma cools and becomes more dense. The newly created lithosphere at ridges is cold and therefore occupies less volume and is more dense than hotter rocks. The newly created lithosphere at ridges is hot and therefore occupies more volume and is less dense than cooler rocks.
Why are mid-ocean ridges higher in elevation than the surrounding ocean floor quizlet?
Why are the mid-ocean ridges higher in elevation than the surrounding ocean floor? Warmer material near the ridge is less dense, so floats higher on the mantle.
Why does the elevation of the seafloor decrease away from mid-ocean ridges?
Mid-ocean ridges and seafloor spreading can also influence sea levels. As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. This increases the volume of the ocean basin and decreases the sea level.
Why does the seafloor decrease in elevation with distance from the mid-ocean ridge quizlet?
Why does the elevation of the seafloor decrease from the mid-ocean ridge to the abyssal plain? The oceanic lithosphere cools and becomes denser.
How will you relate the presence of active volcanoes to the plate tectonic theory explain the concept of the Pacific Ring of Fire?
The abundance of volcanoes and earthquakes along the Ring of Fire is caused by the amount of movement of tectonic plates in the area. Along much of the Ring of Fire, plates overlap at convergent boundaries called subduction zones. That is, the plate that is underneath is pushed down, or subducted, by the plate above.
What is the plate boundary called when two plates are sliding directly into each other?
Convergent boundaries — where crust is destroyed as one plate dives under another. Transform boundaries — where crust is neither produced nor destroyed as the plates slide horizontally past each other.
Why does earthquake occur in subduction zone ?( The area where subduction occur?
Why do so many earthquakes originate in this region? The belt exists along boundaries of tectonic plates, where plates of mostly oceanic crust are sinking (or subducting) beneath another plate. Earthquakes in these subduction zones are caused by slip between plates and rupture within plates.
When oceanic crust meets oceanic crust along a convergent boundary which plate is to be subducted?
denser plate If the two plates that meet at a convergent plate boundary both are of oceanic crust, the older, denser plate will subduct beneath the less dense plate.
What uses radar data from satellites and assists in mapping changes in the surface of the ocean?
How does radar altimetry work? A satellite bounces radar waves off the ocean surface to determine the distance between the satellite and the surface. As the satellite travels in orbit overhead, it records the variation in distance between it and the ocean surface.
How is ocean trench formed?
In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
What is trench Upsc?
A trench marks the position at which the flexed, subducting slab begins to descend beneath another lithospheric slab. Trenches are generally parallel to a volcanic island arc, and about 200 km (120 mi) from a volcanic arc.
Which of the following is a way that Earth science influences Rapid City and areas of the Black Hills either presently or in the past?
In what way does earth science influence Rapid City and areas of the Black Hills, either presently or in the past? Flooding along creeks that drain the Black Hills, titlied rock layers that control the steepness of slopes, tourism from presidents' faces chiseled into granite, large gold deposits.
In what environments does high pressure low temperature metamorphism occur?
In what environment does high pressure low temperature metamorphism occur? High- pressure/low-temperature (HPLT) metamorphism is believed almost exclusively to occur at such cool conditions inside the convergent plate margins.
What differences in their silicate structures account for the slipperiness of talc and the hardness of quartz?
What differences in their silicate structures account for the slipperiness of talc and the hardness of quartz? Quartz has only silicon-oxygen bonds and thus has great hardness and lacks cleavage, mainly because it has equally strong bonds in all directions. Talc, on the other hand, has a sheet structure.