Which of these is a result of an air mass that moves over earth’s surface?
a)tsunami
b)acid rain
c)local weather changes
d)volcanic eruption

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What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

If the distance between two points on the ground is 10 miles and the distance between the same two points on a map is 4 inches, what is the map scale expressed as a ratio?