Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. Iron oxides and clay minerals accumulate as a result of weathering. In a soil, where substances move down from the topsoil, this is the layer, where they accumulate.
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The United States experiences eruptions two or three times a year. Most of them occur in Alaska.
A volcanic eruption refers to the situation where magma is released from a volcano. Volcanic eruptions can be explosive and very dangerous. These eruptions produce lava flows, ash and pyroclastic density currents. destructive. People have died from volcanic blasts. Volcanic eruptions can cause severe threats to health through activities like floods, mudslides, power outages, drinking water contamination, and many more hazardous situations.
More than 1,500 volcanoes have erupted in the past 10,000 years. And among these, about 10 percent have been found occurring in the United States. Most of these volcanoes are found in the Alaska Peninsula.
Learn more about volcanic eruptions here
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Q2. Indians and Africans were considered black. Some Americans were even considered black too.
Answer:
a Political map
Explanation:
focuses on government or administrative boundaries showing countries, states and counties, as well as the location of capitals and major cities.
Answer:
Chlorofluorocarbons from the air conditioners !
Explanation:
