his is Geology! Please help me identify the Sedimentry rocks samples below by answer the following questions: 1. Color(s) 2. Texture & Clast Description (grain size, shape, sorting, etc.) 3. Rock Type (clastic, chemical, organic etc.) SEDIMENTARY ROCK TYPES: Clastic – Clastic or detrital sedimentary rocks form when bits and pieces of other rocks and minerals are compressed and cemented together so that they form a new, solid rock. An example of a clastic rock that you might be familiar with is sandstone, where bits and pieces of sand have been cemented together. Chemical – Chemical sedimentary rocks form when elements that were dissolved in water are able to crystalize. This can happen via evaporation (example: on a salt flat in the desert) where the water is evaporated but the dissolved elements are left behind, or in a body of water when the right temperatures and pressures are reached to cause crystals to form. An example of a rock forming via crystallization in a body of water would be limestone that forms on the ocean floor. Organic – Organic sedimentary rocks form due to an organism that produces them. This usually happens in the oceans, but can also happen on land in swamps or lakes. Coal in a perfect example of an organic sedimentary rock because the plants die and their remains eventually become coal. Biochemical – Biochemical sedimentary rocks form by a combination of chemical and organic processes. Remember that sedimentary rocks are classified using their SEDIMENT SIZE and COMPOSTION. SEDIMENT SIZE: sizes range from large to not visible CLASTIC ROCK TEXTURES: sorting, sphericity, and rounding
This is Geology!
Please help me identify the Sedimentry rocks samples below by answer the following questions:
1. Color(s)
2. Texture & Clast Description (grain size, shape, sorting, etc.)
3. Rock Type (clastic, chemical, organic etc.)
SEDIMENTARY ROCK TYPES:
Clastic – Clastic or detrital sedimentary rocks form when bits and pieces of other rocks and minerals are compressed and cemented together so that they form a new, solid rock. An example of a clastic rock that you might be familiar with is sandstone, where bits and pieces of sand have been cemented together.
Chemical – Chemical sedimentary rocks form when elements that were dissolved in water are able to crystalize. This can happen via evaporation (example: on a salt flat in the desert) where the water is evaporated but the dissolved elements are left behind, or in a body of water when the right temperatures and pressures are reached to cause crystals to form. An example of a rock forming via crystallization in a body of water would be limestone that forms on the ocean floor.
Organic – Organic sedimentary rocks form due to an organism that produces them. This usually happens in the oceans, but can also happen on land in swamps or lakes. Coal in a perfect example of an organic sedimentary rock because the plants die and their remains eventually become coal.
Biochemical – Biochemical sedimentary rocks form by a combination of chemical and organic processes.
Remember that sedimentary rocks are classified using their SEDIMENT SIZE and COMPOSTION.
SEDIMENT SIZE: sizes range from large to not visible
CLASTIC ROCK TEXTURES: sorting, sphericity, and rounding
PICTURE A
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks
Sandstones are composed of particles with an average size of between 2.00 and 0.0625 mm in diameter
sandstones usually have a rough, granular texture, but to really identify a sandstone you have to peer closely at its surface and look for individual sand grains.
Sandstones are made of sand grains that have been cemented together
colors are tan, brown,
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