basalt

Samples from the Moon, like this lunar basalt, are a complex mix of many minerals, and only some can record signals of past magnetic fields.

In another similarity to Mars, the eruption involves basalt, a magma with a honeylike viscosity.

Beneath the basalt was a dense oceanic rock known as gabbro.

The basalt there—a kind of volcanic rock—is famous for being the oldest on Earth, yielding up evidence for the earliest life on our planet, early plate tectonics, and now, it appears, an even more ancient era.

In summer, hop the seasonal shuttle from the ski town of Mammoth Lakes to visit Devils Postpile National Monument and its massive stack of perfectly geometric basalt columns, a dazzling reminder of the area’s ancient volcanic history.

Somewhere in the basalt hills a lion roared, the sound carrying through the night until another responded.

Here there are many craters and much basalt, or even lava; also hot springs.

The whole is built of basalt with yellow marble columns, and yellow marble bands here and there.

They had also said something about pot holes like shafts in the basalt.

Then she rose up and passing amongst them as a friend amongst friends came towards the caves in the basalt cliffs.

There was no getting round that drop, it was a basalt step that circled the whole Lizard Point on its seaward side.