GEOLOGY

Detailed explanation-1: -Clastic sedimentary rocks may have particles ranging in size from microscopic clay to huge boulders. Their names are based on their clast or grain size. The smallest grains are called clay, then silt, then sand. Grains larger than 2 millimeters are called pebbles.

Detailed explanation-2: -Sediments are small fragments of minerals, rocks, or fossils. Sediments range in size from tiny bits of silt or clay to enormous boulders. Sediments are deposited in many different environments.

Detailed explanation-3: -A clast is a fragment of geological detritus, chunks and smaller grains of rock broken off other rocks by physical weathering and clastic rocks are composed of fragments (clasts) of pre-existing minerals and rock.

Detailed explanation-4: -The particles that form a sedimentary rock are called sediment, and may be composed of geological detritus (minerals) or biological detritus (organic matter). The geological detritus originated from weathering and erosion of existing rocks, or from the solidification of molten lava blobs erupted by volcanoes.

Detailed explanation-5: -Sedimentary rocks are one of three main types of rocks, along with igneous and metamorphic. They are formed on or near the Earth’s surface from the compression of ocean sediments or other processes.