Answer the following statement(s) true (T) or false (F)
1.A number of visiting unpiloted spacecraft proved long-standing theories that the surface of Mars wascovered in artificial canals.
2.During the formation of the solar system, the pull of the tides was responsiblefor slowing the rapid spin of the early Earth, which lengthened the day from 12 to 24 hours.
3.By far the greatest percentage of the planet’s volumeis found in the core
4.During the Hadean eon the principal components of the planet were all formed and put in place, but they were very different from their appearance today.
5.The Very LongBaseline Interferometry (VLBI) systemuses numeroussatellites to measure accurately the location of various siteson Earth.
1.False
Explanation: A number of visiting unpiloted spacecraftrefuted long-standing theories that the surface of Mars wascovered in artificial canals, by proving that these were infact natural features. The exploration of Mars by spacecraftbegan in 1965 with NASA’s Mariner 4 probe.
2.True
Explanation: The pull of the tides was also responsiblefor slowing the rapid spin of the early Earth, whichlengthened the day from 12 to 24 hours.
3.False
Explanation: By far the greatest percentage of the planet’s volume(over 80 percent) is found in the mantle. This is an areaof solid rock that extends to depths of 1,800 miles (2,900kilometers).
4.True
Explanation: Geologists refer to this earliest stage of this planet’s history as the Hadean Earth because it was such a “hellish” place. During the Hadean eon the principal components of the planet were all formed and put in place, but they were very different from their appearance today.
5.False
Explanation: The Very LongBaseline Interferometry (VLBI) system uses radio telescopesto record signals from distant quasars, whichprovide fixed reference points.The Global Positioning System (GPS) uses numeroussatellites to measure accurately the location of various siteson Earth.
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