Explain the classification of sedimentary rocks on the basis of the resources used in formation.
Answers
Answer:
How do you know that this is a sedimentary rock?
If you look closely at the rock you will see that it is made of sand-sized particles that have been lithified to create sandstone. The rock is eroding into very unique shapes, but these shapes are more likely to form from a rock made of small cemented together grains than from an igneous or metamorphic rock.
Types of Sedimentary Rocks
Sedimentary rock sizes and features
Rock Sediment Size Other Features
Conglomerate Large Rounded
Breccia Large Angular
Sandstone Sand-sized
Siltstone Silt-sized, smaller than sand
Shale Clay-sized, smallest
When sediments settle out of calmer water, they form horizontal layers. One layer is deposited first, and another layer is deposited on top of it. So each layer is younger than the layer beneath it. When the sediments harden, the layers are preserved. Sedimentary rocks formed by the crystallization of chemical precipitates are called chemical sedimentary rocks. As discussed in the concepts on minerals, dissolved ions in fluids precipitate out of the fluid and settle out
[Figure1]
How do you know that this is a sedimentary rock?
If you look closely at the rock you will see that it is made of sand-sized particles that have been lithified to create sandstone. The rock is eroding into very unique shapes, but these shapes are more likely to form from a rock made of small cemented together grains than from an igneous or metamorphic rock.
Types of Sedimentary Rocks
Conglomerate Large Rounded
Breccia Large Angular
Sandstone Sand-sized
Siltstone Silt-sized, smaller than sand
Shale Clay-sized, smallest
When sediments settle out of calmer water, they form horizontal layers. One layer is deposited first, and another layer is deposited on top of it. So each layer is younger than the layer beneath it. When the sediments harden, the layers are preserved. Sedimentary rocks formed by the crystallization of chemical precipitates are called chemical sedimentary rocks. As discussed in the concepts on minerals, dissolved ions in fluids precipitate out of the fluid and settle out, just like the halite in Figure below.
Halite forming on a rock in the Dead Sea
The evaporite, halite, on a cobble from the Dead Sea, Israel.[Figure2]
Biochemical sedimentary rocks form in the ocean or a salt lake. Living creatures remove ions, such as calcium, magnesium, and potassium, from the water to make shells or soft tissue. When the organism dies, it sinks to the ocean floor to become a biochemical sediment, which may then become compacted and cemented into solid rock