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It depends on the type, but quite often they are not. Granite and basalt are erosion resistant. Some rocks formed by ash deposits, however, erode fairly easily.
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Why do igneous rocks stick up above the ground?
Softer rock is originally around the igneous rock but the soft rock has eroded making the igneous rock visible and above ground level.
Where are the three types of rocks found?
Sedimentary rocks are found generally at the bottom of an ocean as this is where eroded material falls. Igneous rocks are found near volcanoes as they are molten rock. Metamorphic rock can be found anywhere, as it is formed in the ground and slowly comes up to the surface (but it is made of igneous or sedimentary rocks.)
Is shale resistant to erosion?
No, all sedimentary rocks can be eroded and shale is characterised by very fine laminations. Hence the shale breaks easily along these planes of weakness and is therefore easily eroded.
Can clastic rocks be sedimentary rocks?
No, the Grand Canyon is a river valley eroded into rock - as such it is an absence of rock. However the rocks through which the river has eroded are, in the main, of sedimentary origin.
What are igneous rocks that form over the surface?
Rhyolititcen rocks.
Are sedimentary rocks easily eroded?
YES! Sedimentary rocks, like sandstone, limestone and chalk can easily be eroded. This is because the grains in them (different to particles) are further apart to the grains in rocks like igneous rocks. This means that the grains can easily be crumbled off, and you get left with sand.
Can an igneous rock be changed?
Yes, igneous rocks can be metamorphosed or weathered and eroded.
Are volcanic rocks sedimentary?
No. Volcanic rocks are igneous (although not all igneous rocks are volcanic). Sedimentary rocks are made of sediment naturally cemented together. However, volcanic (or extrusive igneous) rocks can be eroded into sediment, which can be cemented, compacted, or otherwise become sedimentary rock such as sandstone or conglomerate. It is then not considered igneous.
How do noncomformities form?
A nonconformity is a place where sedimentary rocks are found on top of eroded igneous or metamorphic rocks. The igneous or metamorphic rocks can be pushed up by forces inside the Earth. Then, erosion can remove some of the rock. Later, sediment may be deposited on top of the eroded rock.
What occurs when sedimentary rocks are deposited on top of uplifted and eroded metamorphic or igneous rocks?
An uncomformity will occur in the rock record.
What classification or kind of rocks results when rocks eroded from higher elevations accumulate at lower elevations?
asial sedimentary igneous metamorphic
Where are igneous rocks?
Igneous rock can be found on the surface in areas of current or recent volcanism or in uplifted and eroded areas of past platonic intrusions, deep underground nearly anywhere, or in areas of past or present glaciations, where igneous rock has been eroded and deposited.
Where rocks came from?
Molten magma cooled to become igneous rocks. Igneous rock eroded to become sediment which washed down into lakes and seas, became compacted and formed sedimentary rocks. Tectonic plate movements created mountain ranges which buried igneous and sedimentary rocks deeply to form metamorphic rocks.
Where igneous rocks are found?
Igneous rock can be found on the surface in areas of current or recent volcanism or in uplifted and eroded areas of past platonic intrusions, deep underground nearly anywhere, or in areas of past or present glaciations, where igneous rock has been eroded and deposited.
What rocks are easily eroded by acid rain?
Calcium based rocks like chalk, limestone and marble are some examples of rocks easily erroded by acid rain.
Why do igneous rocks stick up above the ground?
Softer rock is originally around the igneous rock but the soft rock has eroded making the igneous rock visible and above ground level.
3 main categories of rocks?
Igneous--those that form directly from a molten state. Sedimentary--those that form from eroded particles of various sizes from other rocks. Metamorphic--igneous and sedimentary rocks, and sometimes metamorphic rocks, that undergo a transformation from heat and/or pressure.
