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What rocks are found in the continental crust?
Granite, gneiss, and sedimentary rocks like sandstone and limestone are commonly found in the continental crust. These rocks make up the bulk of the Earth's continents and are less dense than those found in the oceanic crust.
Why is it that ancient rocks are found on the continents and not on the ocean floor?
The entire ocean floor is recycled in roughly 160 million year cycles through the process of plate tectonics. Because continental plates do not subduct, the rock is much, much older, particularly in the continental interior.
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.
ARE Fossils always found in igneous rocks?
No, fossils are typically found in sedimentary rocks rather than igneous rocks. Sedimentary rocks form from the accumulation and lithification of sediments, making them more likely to preserve fossils due to their layered nature. Igneous rocks, on the other hand, form from the cooling and solidification of molten rock and are less likely to contain fossils.
What do rocks found near the source of a river look like versus rocks found farther downstream from source?
Rocks near the source of a river tend to be larger, more angular, and have sharper edges due to less erosion. In contrast, rocks found farther downstream are typically smaller, smoother, and more rounded as they have been more weathered and moved by the flowing water.
What are the layers found in sedementary rocks called?
They're called strata. Strata less than 1cm thick are Laminae.
Where would you most likely find the oldest rock and why?
The oldest rocks are typically found in continental crust regions, particularly in shield areas, which are exposed portions of the ancient crystalline basement rocks. These regions, such as the Canadian Shield or parts of Greenland, contain rocks that have remained relatively undisturbed by tectonic processes. The age of these rocks can often reach over 4 billion years, reflecting the planet's early geological history. Additionally, igneous and metamorphic rocks in these areas are less likely to have been recycled or altered compared to younger sedimentary rocks.
Are there any rocks in tundras?
Yes, there are rocks in tundras. Tundras are typically covered with a layer of vegetation, mosses, and lichens, but rocks can still be found in the soil and surface. These rocks may be uncovered during the short summer thaw or exposed in areas where the vegetation is less dense.
Where can the continental crust be found?
The continental crust can be found beneath the land masses or continents on Earth. It is typically thicker and less dense than the oceanic crust, composed of a variety of rock types including granite, sedimentary rocks, and metamorphic rocks.
What has less density--the crustal rocks or the mantle rocks?
Crustal rock is normally less dense than mantle rock.
Light-colored igneous rocks are less what than dark-colored igneous rocks are?
less dense
Why do larger rocks wear slower than smaller rocks?
When you think about it a larger rock has more surface area to be worn away think about it like if you have a large sweet or a small sweet,which will be gone faster if you suck/chew it,the small sweet because there is less of it
