Answer:
escavation
Explanation:
During excavation, archaeologists often use stratigraphic excavation to remove phases of the site one layer at a time. This keeps the timeline of the material remains consistent with one another.
The United States was the first country to ratify the United Nations Charter.
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Answer: Gneiss
Explanation: Gneiss is a metamorphic rock formed from shale at very high temperature and pressure condition. They exhibit a preferred alignment or orientation of platy minerals called foliation. They are coarse grained and exhibit gneissose banding. They are formed from highest grade regional metamorphism with temperature between 450 - 600 degree celcius and pressure between 800 - 1000 mega pascal. They generally occur in cores of fold mountain belts where mountain ranges have been eroded.
Air pollution is an example of a environmental hazard. Air pollution is caused by the burning of fossil fuels. Pollution is also caused by the gases released from factories and cars. Air pollution leads to many breathing problems, one being asthma. It can also cause global warming. Last, some of the harmful chemicals can cause acid rain. These are a few of the many effects of air pollution.
