- Metric System The metric system has names for very large wei a. One gigaton is 102 times the weight of a hectaton. One hectat Write one gigaton in tons. b. One teraton is 10° times the weight of a kiloton. One kiloton Write one teraton in tons. c. One exaton is 10° times the weight of a teraton. Use your ans part (b) to write one exaton in tons.

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