Answer:
298 million, give or take
If you look at the sky at different times on the same night,
or at the same time on different nights, you'll see either
the same constellations in different places, or different
constellations completely.
Answer:
1. The mesosphere is very important for earth’s protection. The mesosphere burns up most meteors and asteroids before they are able to reach the earth’s surface. The mesosphere is the coldest atmospheric layer surrounding the earth. It becomes cold enough to freeze water vapour in its atmosphere into ice clouds.
2. the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles (80 to 1,000 km) above the earth's surface.
Explanation:
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The united states and Canada share many geographic features, including the great lakes, the Rocky mountains, and Atlantic and pacific coast
Pacific coast cover the west coast of Canada and United states while the Atlantic Coast Cover the eastern part
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