on April 15, 2022
What is mineral Pleochroism?
GeologyPleochroism or dichroism is the change in color evident as the mineral is rotated under plane-polarized light. The primary cause of dichroism or pleochroism in minerals is due to adsorption of particular wavelengths of light. What do you mean by pleochroism? pleochroism, (from Greek pleiōn, “more,” and chrōs, “colour”), in optics, the selective absorption in
on April 15, 2022
Which rock withstands weathering well and is often used for statues?
GeologyMarble carves easily and resists breakage, suiting it well for fine art or decorative sculpture. The metamorphic version of sedimentary limestone and calcite deposits, marble naturally occurs in white, pink, green, gray, brown and black, depending on the other minerals present during its formation. Which two types of rocks are used to make sculptures? Alabaster
on April 15, 2022
How are earthquakes detected?
GeologySeismometers allow us to detect and measure earthquakes by converting vibrations due to seismic waves into electrical signals, which we can then display as seismograms on a computer screen. Seismologists study earthquakes and can use this data to determine where and how big a particular earthquake is. How are earthquakes detected and measured? A seismograph
on April 15, 2022
How did the Quaternary period start?
GeologyThe quaternary period began 2.6 million years ago and extends into the present. Climate change and the developments it spurs carry the narrative of the Quaternary, the most recent 2.6 million years of Earth’s history. Glaciers advance from the Poles and then retreat, carving and molding the land with each pulse. How did Quaternary period
on April 15, 2022
Where are the oldest layers of rock usually found in a cliff made from sedimentary rock?
GeologyWhere are the oldest layers of rock usually found in a cliff made from sedimentary rock single choice? Superposition. Sedimentary rocks are deposited one on top of another. Therefore, the youngest layers are found at the top, and the oldest layers are found at the bottom of the sequence. Where are the oldest rocks in
on April 15, 2022
Where do fault block mountains occur?
GeologyFault-block mountains are present in the Great Basin of the southwestern United States. They may have been present in the western and central parts of West Virginia about 550 million years ago. Complex mountains are formed when the crust is subjected to very large compressive forces (Figure 4). Which boundary do fault-block mountains form? Fault-block
on April 15, 2022
Is halite a silicate?
GeologyHalite (NaCl) is not a silicate mineral. Silicate minerals are minerals which contain silicon and oxygen in their structure. What type of silicate is halite? A silicate mineral is a mineral that contains a combination of the 2 elements Silicon and Oxygen. A nonsilicate mineral does not have a combination of the 2. Halite is
on April 15, 2022
What are the different composition of minerals?
GeologyCrystal structure and habit Crystal family Lengths Common examples Orthorhombic a ≠ b ≠ c Olivine, aragonite, orthopyroxenes Hexagonal a = b ≠ c Quartz, calcite, tourmaline Monoclinic a ≠ b ≠ c Clinopyroxenes, orthoclase, gypsum Triclinic a ≠ b ≠ c Anorthite, albite, kyanite What are the 7 composition of minerals? Minerals are grouped
on April 15, 2022
What is the pressure of the outer core?
Geology1.3 to 3.3 million atmospheres135–330 GPa (from 1.3 to 3.3 million atmospheres). While the field resembles that of a bar magnet, the core is too hot to be magnetized in this way. Is the outer core under the most pressure? Answer 1: The inner core is indeed hotter than the outer core. However, the PRESSURE
on April 15, 2022
What is aeolian dust?
GeologyWhat is meant by aeolian soil? Aeolian sandy soils are those soils which are typically developed from sandy parent material through the action of wind. Such soils generally have a sandy layer 1 m or more thick, consisting mainly of well-sorted fine sand, with over 80% of particles in the size range 0.25–0.05 mm (Chen,