1. Each fragment of the outermost layer of earth is known as -------------------------

2.What useful changes are caused by earthquakes?

1. plate

2.formation of mountains takes place due to earthquakes

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1. Plates (a.k.a Tectonic Plates)

2. ???????????????Is formation of mountains useful?

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 its not exactly useful but is in the positive side instead of the negative side which includes loss of life and property etc etc...but it can be useful also ....

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