Give a reason for each of the following:

(i) Mechanically formed sedimentary rocks are also termed as stratified rocks.

(ii) Rocks like peat, lignite and anthracite are called carbonaceous rocks.

(iii) Fossils are present in sedimentary rocks.

(i) Mechanically formed sedimentary rocks are also termed as stratified rocks because such rocks are formed in layers.

(ii) Rocks like peat, lignite and anthracite are mainly made out of carbon composition (almost 60-90%). Due to this majority of carbon composition in these rocks, these rocks are known as carbonaceous rocks.

(iii) Fossils are found in sedimentary rocks, where gentler pressure and lower temperature allows preservation of past life-forms. Fossils become a part of sedimentary rocks when sediments such as mud, sand, shells and pebbles cover plant and animal organisms and preserve their characteristics through time.