Tundra is the region mostly found north of the Arctic Circle.
A succession of ocean waves set in motion by a submarine earthquake (also known as underwater earthquake) is called a tsunami. This happens when tectonic plates move, converge, or subduct. Submarine earthquakes are common in Asia where there’s a submarine earthquake zone called Pacific Ring of Fire.
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Control and Prevention of two cases of novel coronavirus, ... they became ill and have been self-isolating at home ever ...
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it will option B , hope it helps
