Their contents then solidified to form crystalline rock, one cloud producing enough to blanket large areas to a depth of seven or eight feet.

This land was sea bed 100 million years ago, which formed ancient sedimentary rock, mostly limestone, which easily erodes.

AD these things, the gifts both of land and sea, the immense weight of ocean would bind together until they united to form rock.

When it has stopped moving, lava solidifies to form igneous rock.

The sediment covering the footprints was compressed to form rock.

The range was formed as molten lava cooled to form hard rock in the cores of volcanoes between 26-27 million years ago.

A tombolo is a bar that forms an isthmus between an island or offshore rock and a mainland shore.

The deposits in the channels formed sedimentary rock.

When the plates pull apart, magma comes up from the interior of the Earth and cools to form new rock on the ocean bottom.

The molten rock later cools off and forms hardened rock.