Clastic rocks have a 'clastic texture', which means they consist of clasts. The 3D orientation of these clasts is called the fabric of the rock. Between the clasts the rock can be composed of a matrix or a cement (the latter can consist of crystals of one or more precipitated minerals). The size and form of clasts can be used to determine the velocity and direction of current in the sedimentary environment where the rock was formed; fine, calcareous mud only settles in quiet water, while gravel and larger clasts are only deposited by rapidly moving water.[10][11] The grain size of a rock is usually expressed with the Wentworth scale, though alternative scales are used sometimes. The grain size can be expressed as a diameter or a volume, and is always an average value - a rock is composed of clasts with different sizes. The statistical distribution of grain sizes is different for different rock types and is described in a property called the sorting of the rock. When all clasts are more or less of the same size, the rock is called 'well-sorted', when there is a large spread in grain size, the rock is called 'poorly sorted'
True. Sedimentary rocks can undergo metamorphism when they are subjected to high temperatures and pressures deep within the Earth's crust. This process transforms the mineral composition and texture of the rock, creating metamorphic rocks.
Detrital rocks form from the accumulation and cementation of sediment grains derived from the weathering and erosion of pre-existing rocks. The size, shape, and composition of the sediment grains help to identify the environment in which the detrital rock formed. Detrital rocks include sandstone, shale, and conglomerate.
Sedimentary rocks formed from the remains of plants and animals are called organic sedimentary rocks. Examples include coal, formed from the remains of plants, and limestone, formed from the shells of marine organisms.
False. Most sedimentary rocks cannot be directly dated by radiometric methods because they are composed of sediments that were already eroded and transported from existing rocks. Instead, geologists use relative dating techniques to determine the sequence of events in which sedimentary rocks were formed.
True. Sedimentary rocks are formed from the accumulation and compression of particles deposited by water, wind, or ice over time. These particles can include clay, sand, and organic matter.
True. Sedimentary rocks can undergo metamorphism when they are subjected to high temperatures and pressures deep within the Earth's crust. This process transforms the mineral composition and texture of the rock, creating metamorphic rocks.
Detrital rocks form from the accumulation and cementation of sediment grains derived from the weathering and erosion of pre-existing rocks. The size, shape, and composition of the sediment grains help to identify the environment in which the detrital rock formed. Detrital rocks include sandstone, shale, and conglomerate.
False. The terms folidated and nonfoliated apply to metamorphic rocks.
Sedimentary rocks formed from the remains of plants and animals are called organic sedimentary rocks. Examples include coal, formed from the remains of plants, and limestone, formed from the shells of marine organisms.
no its not
answer:true
It is true that the composition of a sedimentary rock depends upon the composition of the rocks and living things its sediments come from. Sedimentary rocks form through lithification.
Yes, it is true. Sediments get blown together by wind, and then layer on top of each other. Over time, there's lots of pressure, and the lower sediments become sedimentary rocks.
True
That is false. The 3 main types of rocks are igneous, sedimentary, and metamorphic
Yes m that it true, other than glasses all rocks have grains.
True