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18,000 years ago was the last glacial maximum in North America.
The Last Glacial Maximum (LGM) occurred during the final phase of the Pleistocene, about 18,000 years ago. At that time, the world's sea level was more than 400 feet lower than it is today, and glaciers covered about 8% of the earth's surface. 25% of the Earth's land area.
The end of the Glacial Maximum, about 18,000 years ago, is often called the end of the ice age, even though Antarctica and Greenland have vast expanses of ice year-round.
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D, 8100 seconds is equal to 2 hours and 15 minutes
Mineral of volcanic origin with large crystals is formed by magma that cooled off deeper into the crust.
Explanation:
The rocks of volcanic origin are divided into two main categories by the place of formation, extrusive igneous rocks and intrusive igneous rocks. The extrusive igneous rocks are the ones that form on the surface or near the surface. The intrusive igneous rocks are the ones that form deeper into the crust.
The intrusive igneous rocks are formed by magma that has managed to penetrate the crust, but didn't managed to come to the surface. It started to cool off slowly over longer period of time, thus solidifying. Because the solidifying has been very slow, the minerals formed in this manner have big minerals, as they had time to grow.
Minerals of this type are:
- granite
- diorite
- peridotite
- gabro
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People may also use alcohol or drugs because of a desire to escape
reality, relieve stress, forget a trauma, ease physical or emotional
discomfort, manage side effects of other drugs or medications, or try
and reduce symptoms of a mental illness. The term self-medicating is used when substances, drugs or alcohol, are abused to mask symptoms of a mental health issue.
