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Which type of rock would likely be found at the bottom of a river bed?

A Sedimentary
Explaination
Sedimentary rock is formed from ‘sediment’, which is a mixture of sand, shells, and other small pieces of material commonly located at the bottom of a river or lake. Basalt is a type of igneous rock, formed from volcanoes.
B Igneous
C Metamorphic
D Basalt