What type of igneous rock makes up the ocean floor? Which rock has more silica in it: granite or basalt? What rock comes before quartzite in the rock cycle? What's the difference between granite and quartzite? Which igneous rock forms when basaltic lava hardens?
Igneous rocksform when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. How is a Xenolith formed? The rock that forms from cooled magma is called igneous rock. Xenoliths are different types of r...
What forms when magma cools? What forms when a large volcano collapses in on itself? What type of magma forms in a magma chamber? What type of rock forms when magma cools? What rock forms from magma? Where does magma that fills the magma chamber come from? What causes magma to form?
Heather: Yeah, we call it molten rock. It's full of different elements like iron and calcium. Nij: Hmm, sounds nutritious. Kids: You can't eat it, Nij Nij: Oh! How does it turn into hard rocks? Heather: When it's too hot, nothing can stick together. But as the magma cools dow...
There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocksoriginate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers. ...
Granite () is a coarse-grained igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. Dolerite A dark, fine-grained igneous rock; diabase. Granite A comm...
A volcanic pipe could go centuries without any lava activity. Others are regularly active, due to the edges of tectonic plates rubbing together and causing molten rock to pressurize in underground magma chambers. A pipe could also see more action if tectonic plates are being pulled apart, which...
Obsidian forms when lava cools quickly. When lava cools more slowly, crystals begin to form, giving the rock a more textured appearance. Snowflake obsidian can form underground, in cracks that the magma seeps into, or above ground in slow-moving, silica-rich lava flows. ...
"Melt" is a verb describing the process of turning solid into liquid due to heat, while "molten" is an adjective describing a substance in its liquid state due to high temperatures.
the lava comes up from the mantle (which is the layer under the surface). Once there's enough molten rock — called magma — and enough pressure on it, a volcanic eruption occurs. In many volcanoes, the magma rises up through a central tube or "throat," and emerges out the top of ...