Researchers from the International Blast Injury Research Network at the University of Southampton conducted a survey to understand how the mental health of displaced Ukrainians has been affected by the ongoing war. Their ...
Apr 11, 2024
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Combining two treatments could be a promising option for people, especially military veterans, whose lives are negatively affected by post-traumatic stress disorder, a new study shows.
Mar 6, 2024
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People with obsessive-compulsive disorder (OCD) may have an increased risk of death from both natural and unnatural causes than those without the disorder, finds a study from Sweden published in The BMJ today.
Jan 17, 2024
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What the Israeli hostages have had to go through is unimaginable. The trauma of that unexpected, barbaric attack by Hamas, the murder of loved ones, then being violently abducted and dragged down into tunnels deep underground ...
Nov 30, 2023
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Question: I'm reaching out because I'm in a tough spot. A close friend rode out Hurricane Ian in Florida last year and it seems to me that he's struggling now. He's angry and jumpy, while being numb to what's happening around ...
Nov 16, 2023
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A study from the University of Georgia has found that complex post-traumatic stress disorder—a type of PTSD caused by chronic, long-lasting or repeated traumatic events—plays an important role in how trauma impacts lesbian, ...
Oct 24, 2023
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In recent years, interest in psychedelics and their possible benefit in treating psychiatric illnesses has been revived. Expectations are high, especially in obsessive-compulsive disorder, where patients' therapeutic options ...
Oct 6, 2023
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Personality traits and mental health problems are among the factors linked to erectile dysfunction (ED), a condition that affects up to 80% of men over the age of 60. But researchers often overlook these psychological causes ...
Sep 27, 2023
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A team of critical care specialists and psychologists affiliated with institutions in the U.K. and Sweden has found that the video game Tetris can prevent intrusive memories in nurses who have cared for patients with COVID-19. ...
Who hasn't had a thought they can't get out of their mind? Or had a random or inappropriate idea pop into their head? Or felt compelled to double-check and triple-check that the front door is locked? Such intrusive thoughts ...
Sep 15, 2023
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An intrusion is liquid rock that forms under Earth's surface. Magma from under the surface is slowly pushed up from deep within the earth into any cracks or spaces it can find, sometimes pushing existing country rock out of the way, a process that can take millions of years. As the rock slowly cools into a solid, the different parts of the magma crystallize into minerals. Many mountain ranges, such as the Sierra Nevada in California, are formed mostly by intrusive rock, large granite (or related rock) formations.
Intrusions are one of the two ways igneous rock can form; the other is extrusive, that is, a volcano eruption or similar event. Technically speaking, an intrusion is any formation of intrusive igneous rock; rock formed from magma that cools and solidifies within the crust of a planet. In contrast, an extrusion consists of extrusive rock; rock formed above the surface of the crust.
Intrusions vary widely, from mountain range sized batholiths to thin vein-like fracture fillings of aplite or pegmatite. When exposed by erosion, these cores called batholiths may occupy huge areas of Earth's surface. Large bodies of magma that solidify underground before they reach the surface of the crust are called plutons.
Coarse grained intrusive igneous rocks that form at depth within the earth are called abyssal while those that form near the surface are called hypabyssal. Intrusive structures are often classified according to whether or not they are parallel to the bedding planes or foliation of the country rock: if the intrusion is parallel the body is concordant, otherwise it is discordant.
A well-known example of an intrusion is Devil's Tower.
This text uses material from Wikipedia, licensed under CC BY-SA
