For the following, round off each number to three significant digits, and then express it in scientific notation. 1) 3.478
2) 65.345
3) 4444
4) 3.1416
5) 55555
6) 45.35455

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.

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