Where does hematite come from?
GeologyThe most important deposits of hematite are sedimentary in origin. The world’s largest production (nearly 75 million tons of hematite annually) comes from a sedimentary deposit in the Lake Superior district in North America. How is hematite created? It can crystallize during the differentiation of a magma or precipitate from hydrothermal fluids moving through a
What is the difference between a crack and a fissure?
GeologyHere’s how: A crack is a broken piece of countertop that is most of the time, chipped, uneven, and widely separated and is usually the result of man-made stresses. On the other hand, a fissure is a part of the stone that resembles a crack, yet it is a result of natural geological formation or
How does glaciation turn interlocking spurs into truncated Spurs?
GeologyHow are truncated spurs formed? Definition: Truncated spurs are landforms that occur in glaciated areas. When a valley fills with a glacier, any land which is in the way of the moving glacier will be eroded away. Truncated spurs have steep sides which show this erosion. This erosion can also be caused by moving water.
What is the difference between dolomite and granite?
GeologyFor example, it offers great resistance to pressure, heat, and other types of wear and tear, resulting in dolomite countertops not being very susceptible to dents, abrasions, and scratches. Although dolomite is not as hard as granite, it’s much harder than marble, making it a more chip and scratch-resistant option. Is dolomite the same as
How often does the San Andreas Fault have a major earthquake?
GeologySeismologists discovered that the San Andreas Fault near Parkfield in central California consistently produces a magnitude 6.0 earthquake approximately once every 22 years. When was the last time the San Andreas Fault had an earthquake? There have been many quakes in California over the past century, but the last time a big temblor occurred along
How is terrane different from terrain?
Geologyis that terrane is (geology) a block of the earth’s crust that differs from the surrounding material, and is separated from it by faults while terrain is (geology) a single, distinctive rock formation; an area having a preponderance of a particular rock or group of rocks. How can you tell a terrane? Overlap formations and
What is a terrane in geology?
GeologyA terrane is defined as a fault-bounded block containing rocks that have a distinct geologic history compared with contiguous blocks. What is a terrane and how does it form? In geology, a terrane (in full, a tectonostratigraphic terrane) is a crust fragment formed on a tectonic plate (or broken off from it) and accreted or
Which answer is not a real life example of geologic cross sections?
GeologyWhat are cross sections in geology? A geological cross-section is a graphic representation of the intersection of the geological bodies in the subsurface with a vertical plane of a certain orientation. What does a cross-section show about the earth? The Cross section of the Earth is a visualization of the composition of the Earth in
Is Mount Etna a composite or shield volcano?
GeologyComposite volcanoes are steep-sided and cone-shaped, made up of layers of ash and lava and containing sticky lava which doesn’t flow very far. Mount Etna in Italy is a composite volcano. Shield volcanoes have gently sloping sides and runny lava that covers a wide area. What type of volcano is Mt St Etna? Stratovolcano Mount
When was the last tsunami in the Atlantic Ocean?
GeologyNovember 18, 1929November 18, 1929, on the southern edge of the Grand Banks, 280 km south of Newfoundland (Fine et al., 2005). The tsunami was caused by a submarine slide, which was triggered by an unusually large (for this region) magnitude 7.2 earthquake. Has the Atlantic Ocean ever had a tsunami? The most widely known