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As a result of the volcanoes in Iceland and Hawaii having a lot of basalt, the beaches are made of black sand.
Basalt is a dark volcanic rock that is often found in areas with volcanoes. It has this color as a result of a huge amount of augite and other dark minerals.
Areas with an abundance of basalt such as beaches in Iceland and Hawaii will reflect this dark color by forming black sand as a result of being mixed with Basalt.
Find out more on basalt at https://brainly.com/question/7609621.