MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Morro Rock, a basalt rock formation in Morro Bay, California, USA, at night. Basalt is a dark fine-grained igneous rock produced in volcanic eruptions. Morro rock was formed in the Cenozoic Period (27-20 million years ago) and reached a height of 175 metres.
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