WORLD HISTORY

Detailed explanation-1: -Fossils are the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers. Fossils also include any preserved trace of life that is typically more than 10 000 years old.

Detailed explanation-2: -Drying & Desiccation Desiccation, also known as mummification, is a very unique and rare form of fossilization. Desiccated/mummified fossils are next in quality to frozen fossils. Bones and tissues of desiccated organisms of the desert are well preserved, although they often fall apart at the slightest touch.

Detailed explanation-3: -A mold fossil forms when the remains of an organism leave a mark in sediment that hardens before the organism rots or is washed away. Sediment can then fill in that mold, forming what looks like a sand or clay version of the organism; this is called a cast fossil.

Detailed explanation-4: -The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. This may be somewhat surprising, since the oldest rocks are only a little older: 3.8 billion years old! Cyanobacteria are among the easiest microfossils to recognize.

Detailed explanation-5: -Fossils: Fossils are preserved parts of dead organisms. This is the impression of once-living organisms on the earth. Examples of fossils are animal bones, shells, stone imprints, cast molds, etc.