NASA's Perseverance rover has been busy gathering bits of Mars — rock cores the size of chalk sticks, clusters of broken fragments no bigger than pencil erasers, and even grains of dust fine enough to ...

The East African Rift threatens to split the massive contient into two plates in the distant future, though geological events ...

For a brief, but exciting, time last year, Earth had two moons. A small asteroid lingered close to our planet in its orbit around the Sun, temporarily caught by Earth’s gravity to become a far away ...

Tephra includes large, dense chunks, light rock debris, and ash ... On volcanoes, a fissure is an elongated fracture or crack at the surface from which lava erupts. Fissure eruptions typically ...

is one of the many processes that occur in the rock cycle. Weathering breaks down rocks on the surface of the Earth. This describes rocks being broken up by changes in temperature, freezing and ...

It appears to be composed of rock broken off from the moon's surface and ejected into space after a large impact. "We had a general idea that this asteroid may have come from the moon, but the ...