Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive ...

An igneous rock has come to be regarded, more constantly than before, not merely as a mineral-aggregate, but as-the product of consolidation of a molten rock-magma; ...

One lucky bidder will soon fork over millions of dollars to take home NWA 16788, a 54-pound (24-kilogram) Martian meteorite.

Perseverance rover retrieves key rocky clues to Mars' geologic and water history After return of rock samples to Earth in 2033, analysis will answer outstanding questions about when water flowed ...

WRITING with reference to the review of Hatch and Wells' "Petrology of Igneous Rocks", which appeared in NATURE of May 28, p. 952, Dr. A..K. Wells has directed attention to the second paragraph ...

Characteristics of igneous rocks. These rocks are formed when magma solidifies. As the magma cools, mineral crystals will begin to grow. These crystals will grow and interlock to form a hard ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Why don’t rocks burn? – Luke, age 4, New Market, ...

Our planet has been asteroid-smashed, melted and eroded, enough that most of its original armor has been long buried. Except for one small chunk.

Microbes have been discovered alive inside 2-billion-year-old rock, offering a rare window into Earth’s deep past. Found in ...