Answer:
The atmosphere protects the Earth from radiation and cosmic rays coming from the outer space. The ozone layer in the Earth's atmosphere protects the Earth from harmful ultraviolet radiations. The dense layers of molecular gases absorb the cosmic rays, gamma rays, and x-rays thereby blocking most of the harmful effects.
Explanation:
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Ethnicity is a term that can be categorized by race, nationality, religion etc... All those things can determine ethnicity.
Answer;
-Elevation between the areas is different
Explanation;
-The locks have been created between the Great Lakes and the St. Lawrence River because of the elevation between the areas is different. The Great Lakes and the St Lawrence River with the Atlantic Ocean are linked by St Lawrence Seaway which is a system of locks, canals and channels. The seaway provides passage for oceangoing vessels into central North America.
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