What type of rock is dolostone?
GeologyDolostone is a fine-grained sedimentary rock composed primarily of dolomite, a calcium and magnesium carbonate mineral. Dolostone is similar to limestone and is in some cases formed secondarily from chemically-altered limestone. Is dolostone a metamorphic rock? It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic
How big is the crust of earth?
GeologyThe average thickness of the crust is about 15 km (9 mi) to 20 km (12 mi). Because both continental and oceanic crust are less dense than the mantle below, both types of crust “float” on the mantle. How much of the Earth is crust? 1 percent Regions of the Earth The core forms only
Which rocks are best for radiometric dating?
GeologyIgneous rocks are the best types of rock samples to use for radiometric dating. When igneous rock forms, elements are separated into different minerals in the rock. Thus, when they form, minerals in igneous rocks often contain only a parent isotope and none of the daughter isotope. Which rocks are used in radiometric dating? Most
What was the cause of Mount Pinatubo eruption?
GeologyIn March and April 1991, however, molten rock (magma) rising toward the surface from more than 20 miles (32 kilometers) beneath Pinatubo triggered small earthquakes and caused powerful steam explosions that blasted three craters on the north flank of the volcano. What tectonic plates caused the Mt Pinatubo eruption? Mount Pinatubo lies beneath a devastating
Is there a fault line in the Atlantic Ocean?
GeologyThe Azores–Gibraltar Transform Fault (AGFZ), also called a fault zone and a fracture zone, is a major seismic zone in the Eastern Atlantic Ocean between the Azores and the Strait of Gibraltar. Does the Atlantic Ocean get earthquakes? In the past 24 hours, the North Atlantic Ocean had 1 quake of magnitude 4.4, 12 quakes
How metamorphic rocks are made?
GeologyMetamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet. How are metamorphic rocks formed easy answer? Metamorphic rocks are formed from other rocks that are changed because
Why are earthquakes felt more on the East Coast?
GeologyThere is a geological explanation. The Earth’s crust beneath the Eastern U.S. is “older and colder” than out West. The fault lines are more healed. As a result, the East is far less seismically active — but when earthquakes do hit, that hard ground is far more effective and conducting the seismic waves. Are earthquakes
When did the Kashmir Earthquake end?
GeologyThe 2005 Kashmir earthquake occurred at 08:50:39 Pakistan Standard Time on 8 October in Pakistani-administered Azad Kashmir.…2005 Kashmir earthquake. Kabul Islamabad Lahore Local time 08:50 PKT Magnitude 7.6 Mw Depth 15 km (9.3 mi) Epicenter 34.45°N 73.65°ECoordinates:34.45°N 73.65°E What was the duration of the Kashmir earthquake? The epicenter of this earthquake was located around Muzaffarabad,
How old is the Earth’s outer core?
GeologyThe 1 billion to 1.3 billion year result suggests that Earth’s core is “actually relatively young,” Lin said. This estimate isn’t as young as some estimates, such as one published in 2016 in the journal Nature (opens in new tab) that used similar methods but found the core was a mere 700 million years old.
What is coastal downwelling?
GeographyDownwelling 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