Most of them came from central africa and west africa.
Answer:
The ions of the solar wind collide with atoms of oxygen and nitrogen from the Earth's atmosphere in the ionosphere. The energy emitted during these collisions creates an aurora, which is a colorful glowing halo around the poles. When the solar wind is the strongest, the auroras are the most active.
Explanation:
Answer:
ranked 25 out of 138
Explanation:
North Korea Military Strength (2020) Unpredictability and secrecy remain at the heart of the Hermit Kingdom. For 2020, North Korea is ranked 25 of 138 out of the countries considered for the annual GFP review. It holds a PwrIndx* rating of 0.3718 (0.0000 considered 'perfect').
Answer:
Acid soils have a pH below 7 and alkaline soils have a pH above 7. Ultra-acidic soils (pH < 3.5) and very strongly alkaline soils (pH > 9) are rare.[2][3]
