What is the cleavage of basalt?
GeologyBasalt is primarily made of the mineral oblivine, which has no cleavage or planes of weakness. Is basalt a fracture? Columnar basalt During the cooling of a thick lava flow, contractional joints or fractures form. If a flow cools relatively rapidly, significant contraction forces build up. What is the cleavage of the rock? Cleavage is
Where does coastal downwelling occur?
GeologyDownwelling occurs at anti-cyclonic places within the ocean where warm rings are spinning clockwise creating surface convergence. When these surface waters converge, they push the surface water downwards. Another way that downwelling can occur is by the wind driving the sea towards the coastline. How does coastal downwelling occur? The reverse process, called “downwelling,” also
When was the last volcanic eruption in California?
GeologyMay 22, 1915May 22, 1915, when Mount Lassen sent pulverizing streams of volcanic debris down its slopes. When was the last time a volcano erupted in CA? The last series of eruptions in California occurred from 1914 to 1917 within the Lassen Volcanic Center, with an explosive eruption of Lassen Peak on May 22, 1915.
Where was Big Sur landslide?
Geology questionsA 150-foot-stretch of the roadway, located about 15 miles south of the town of Big Sur, completely fell away on Jan. 28 during a mudslide caused by a burn scar. This is far from first time that a landslide has forced the closure of a section of Highway 1 in the Big Sur area, which
How do intrusive igneous rocks form?
GeologyIntrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Great globs of molten rock rise toward the surface. How do intrusive igneous rocks form quizlet? Intrusive igneous rocks form when magma cools and solidifies within Earth. Extrusive igneous rocks form when lava cools and hardens at the
Why do intrusive igneous rocks have large crystals?
GeologyIntrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. The cooling of magma deep in the Earth is typically much slower than the cooling process at the surface, so larger crystals can grow. Why are crystals larger in intrusive rock than extrusive
How does the earthquake early warning system work?
GeologyEarthquake early warning systems don’t predict earthquakes. Instead, they detect ground motion as soon as an earthquake begins and quickly send alerts that a tremor is on its way, giving people crucial seconds to prepare. How does an earthquake early warning system work quizlet? Earthquake early warning systems are possible because when an earthquake begins
What is feldspar made out of?
GeologyChemically, the feldspars are silicates of aluminium, containing sodium, potassium, iron, calcium, or barium or combinations of these elements. What type of mineral is feldspar? silicate minerals Feldspar is the name of a large group of rock-forming silicate minerals that make up over 50% of Earth’s crust. [1] They are found in igneous, metamorphic, and
What animals lived in the Tertiary Period?
GeologyDuring the tertiary period, mammals diversified rapidly. Some examples were bears, hyenas, insectivores, whales, dolphins, walruses, rabbits, monkeys, apes, lemurs, hippopotamus, hoofed mammals, early mastodons, seals, horses, rhinoceros, rodents, oreodonts, and humans ( Australopithecus). 2. What lives in the Tertiary Period? The Tertiary witnessed the dramatic evolutionary expansion of not only mammals but also flowering
How are biochemical sedimentary rocks made?
GeologyBiochemical sedimentary rocks are formed from shells and bodies of underwater organisms. The living organisms extract chemical components from the water and use them to build shells and other body parts. The components include aragonite, a mineral similar to and commonly replaced by calcite, and silica. How are biochemical sedimentary rocks made quizlet? How do