Describe sedimentary rocks

Answer 1

Sedimentary rocks are lithified sediments, the origin of which may be from igneous, metamorphic, or other sedimentary rock, and in some cases chemical solutions or organic matter. Erosion and weathering of rock creates a range of rock particles from boulder sized to microscopic. These particles are transported by wind, water or landslide to a point of deposition or resting place. If these particles continue to be covered with additional layers of particles, the compression from the weight above, will, in time remove most of the water from the sediments. As the water is removed, cementing minerals, such as calcite or quartz, solidify from the remaining solution and fill in the gaps between the particles. The result is a lithified sediment, better known as sedimentary rock.

Answer 2

Biological sedimentary rocks are formed from organic processes that involve living organisms producing the sediments. These living organisms can be snails and clams whose discarded calcium carbonate shells can form limestone. But it also includes swamp plants whose organic debris can produce coal if conditions are right. Although the origin of the sediments are organic, most of the chemicals that the living organisms used to produce their shells or their body parts have origins from previous rocks. Thus these are sedimentary rocks, but with a biogenic intermediate

Answer 3

There are two types of biological sedimentary rocks:

1. Limestone - formed from the hard parts of ancient organisms.
2. Coal - formed from plant material which has been compressed for millions of years.

Answer 4

sedimentary rocks are formed from older rocks that have been broken into tiny fragments . Wind and rain take away these tiny bits of rocks to water bodies. They sink to the bottom and form layers called sediments .Over millions of years the pressure turns these layers into hard layers after some time they break up and form sedimentary rocks.

Answer 5

Organic sedimentary rock is derived mostly from the remains of organisms which have lithified into rock. Examples would be coal and chalk.

Answer 6

a rock formed by unconsolidated sediment deposited in layers

Answer 7

full of sediment.