on April 16, 2022
What is in a glacier?
GeologyA glacier is a large, perennial accumulation of crystalline ice, snow, rock, sediment, and often liquid water that originates on land and moves down slope under the influence of its own weight and gravity. What are the main parts of a glacier? Glaciers have two main sections: the accumulation area and the ablation area. The
on April 16, 2022
How does a lateral moraine form?
GeologyA lateral moraine forms along the sides of a glacier. As the glacier scrapes along, it tears off rock and soil from both sides of its path. This material is deposited as lateral moraine at the top of the glacier’s edges. Lateral moraines are usually found in matching ridges on either side of the glacier.
on April 16, 2022
Is Indonesia a volcanic island arc?
GeologyThe Indonesian region includes several volcanic island arcs that are highly active at the present day, and also contains a record of Cenozoic volcanic activity owing to subduction of oceanic lithosphere at the margins of SE Asia. Is Indonesia an island arc? The Sunda Arc is a volcanic arc that produced the volcanoes that form
on April 16, 2022
Who are the scientist involved in the study of earth science?
GeologyGeologistsGeologists, geographers, naturalists, oceanographers, and paleontologists. What are scientists who study the earth? A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape them. Geologists usually study geology, although backgrounds in physics, chemistry, biology, and other sciences are
on April 16, 2022
What is porphyritic andesite?
GeologyDescription. Andesite-porphyry is a porphyry with andesitic chemism. The term “porphyry” is used for igneous rock composed of large, conspicuous crystals (phenocrysts) and a fine grained to glassy groundmass (matrix) in which the phenocrysts are embedded. How is porphyritic andesite formed? Porphyritic texture — andesite: This is an extrusive igneous rock. The magma from which
on April 16, 2022
What is special about Basalt?
GeologyBasalt is a mafic extrusive rock, is the most widespread of all igneous rocks, and comprises more than 90% of all volcanic rocks. Because of its relatively low silica content, basalt lava has a comparatively low viscosity, and forms thin flows that can travel long distances. What makes basalt special? basalt, extrusive igneous (volcanic) rock
on April 16, 2022
What did Harry Hess discover that helped Wegener prove the continental drift theory?
GeologyAlfred Wegener produced evidence in 1912 that the continents are in motion, but because he could not explain what forces could move them, geologists rejected his ideas. Almost 50 years later Harry Hess confirmed Wegener’s ideas by using the evidence of seafloor spreading to explain what moved continents. What did Harry Hess find as evidence
on April 16, 2022
What are the causes of tsunamis?
GeologyTsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean. What are the 5 causes of tsunami? Tsunamis are caused by violent seafloor movement associated with earthquakes, landslides, lava entering the sea,
on April 16, 2022
What are the stages of rock folding?
GeologyWhen a rock is subjected to increasing stress it passes through 3 successive stages of deformation. Elastic Deformation — wherein the strain is reversible. Ductile Deformation — wherein the strain is irreversible. Fracture – irreversible strain wherein the material breaks. What is the process of rock folding? When two forces act towards each other from
on April 16, 2022
What igneous rock does quartzite turn into?
GeologyQuartzite is a metamorphic rock, while quartz is an igneous rock that crystallizes from magma or precipiates around hydrothermal vents. Sandstone under pressure becomes quartz arenite and quartzite, but quartzite does not become quartz. The construction industry further complicates the matter. What does quartzite turn into? quartzite, sandstone that has been converted into a solid