Igneous rock forms from magma, or liquid rock inside the Earth. Igneous rocks form when tectonic activity causes magma to be released to the surface...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough...
What rock forms from magma? Give an example of extrusive igneous rock. What type of rock is basalt? Is gabbro an intrusive or extrusive rock? Is diorite an igneous rock? What igneous rock floats in water? Is obsidian an igneous rock? Which turns metamorphic and sedimentary rocks into igneous...
Next, clastic sedimentary rocks are ones which form when rock layers generate because of the mechanical weathering of different rock types. After that, we have chemical sedimentary rocks which form when a chemical reaction happens between minerals that exist in rock forms cools down as precipitate a...
As the name "cinder cone" suggests, they are cone-shaped hills made up of ejected igneous rocks known as "cinders". These small volcanoes usually have a circular footprint, and their flanks usually slope at an angle of about 30 to 40 degrees. Most cinder cones have a bowl-shaped crater...
From rocks, we have learned of dinosaurs, trilobites and thousands of other life forms that existed on earth once but are now no more. Rocks tell us that the continents we know today have moved and were once connected together. In fact we have learned that the earth is constantly moving,...
Silicon forms hard, lustrous, brittle crystals that conduct electricity in a predictable way. Humans have found so many ways to use silicon in its various forms that we're spoiled for choice to describe them. Instead, we'll use broad strokes to paint a bigger picture. Starting at the ...
When we discuss, “The Earth’s crust,” we’re talking about the outer layer of the Earth’s surface. This is part of the lithosphere. The crust’s made from 3 different types of rock: Igneous; sedimentary; and, metamorphic. Igneous rock forms when cracks in the Earth, known as fissu...
There are three forms of weathering, constituting physical, chemical and biological processes. Though weathering can be confused with erosion, there are subtle differences. Erosion occurs with the breakdown, transportation and deposition of material, while weathering alters or disintegrates material at its...
Obsidian is produced by rapidly cooling felsic lava extruded from a volcano with minimal growth in crystals. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) gives rise to a high viscosity that forms a ...
(O3) is composed of three oxygen atoms. It forms when atmospheric oxygen (O2) interacts with solar radiation and breaks apart into two oxygen atoms; each atom then joins up with an oxygen molecule. The ozone molecule is unstable, so it soon decays to again form molecular oxygen. This ...