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16. A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. A mountain differs from a plateau in having a limited summit area, and is larger than a hill, typically rising at least 300 metres above the surrounding land.
17. Drawing in attachment!
examples of fold mountains are the Himalayas, Andes, and Alps.
18. fault-block mountain is another name of block mountain.
19.There are two types of fold mountains.
20. Volcanic mountains: These mountains are formed as a result of the cooling down of lava and other materials that come out of a volcano during volcanic eruptions. Mount Kilimanjaro, mount Fuji are examples.

Ecology is the study of the relationship between living organisms and their environment. An ecosystem is a place, such as a rotting log, a forest, or even a schoolyard, where interactions between living and non-living things occur.