What is subduction in geology?
Regional SpecificsSubduction occurs when an oceanic plateoceanic plateOceanic crust is the uppermost layer of the oceanic portion of the tectonic plates. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. The crust overlies the solidified and uppermost layer
What types of rocks are basalt?
Regional SpecificsWhat is Basalt? Basalt is a dark-colored, fine-grained, igneous rockigneous rockIgneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. What type of metamorphic rock
Which type of volcano has side vents?
Regional SpecificsStratovolcano. Stratovolcanoes have relatively steep sides and are more cone-shaped than shield volcanoes. They are formed from viscous, sticky lava that does not flow easily. The lava therefore builds up around the vent forming a volcano with steep sides. Which volcano has a side vent? Nyiragongo volcano (DR Congo): side vent inside crater again active,
What is the most recent eon?
Regional Specificsthe Phanerozoicthe Phanerozoic, which began about 540 million years ago. This eon is very distinct from the previous three—the Hadean, Archean, and Proterozoic—which are sometimes known as the Precambrian era. What are the 4 eons in order? For example, the entire age of the earth is divided into four eons: the Hadean Eon, the Archean
Where are subduction zones?
Regional SpecificsSubduction zones occur all around the edge of the Pacific Ocean, offshore of Washington, Canada, Alaska, Russia, Japan and Indonesia. Called the “Ring of Fire,” these subduction zones are responsible for the world’s biggest earthquakes, the most terrible tsunamis and some of the worst volcanic eruptions. What plates have subduction zones? Only oceanic plates, which
What are the 8 properties used to identify minerals?
Regional SpecificsMost minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity. What are the 10 mineral properties? These include: color, streak, hardness, luster, diaphaneity, specific gravity, cleavage, fracture, magnetism, solubility, and many more. These physical properties are useful for identifying minerals. What are the