Geologists have recently determined that the minerals goethite and hematite exist in abundance on Mars, sure signs of the presence of water (see Figure 1 for a picture). None of those geologists have been to Mars, of course, but the unmanned rovers Spirit and Opportunity have. These rovers are equipped with three mass spectrometers, each of which is capable of determining the chemical composition of a solid with a high degree of accuracy. With such a precise chemical analysis in hand, geologists on Earth had no problem identifying the minerals.
A mineral is defined in part by a specific chemical composition. In theory, therefore, it is always easy to identify a mineral, if you can determine the chemical composition with a mass spectrometer like the Mars rovers. In reality, however, even if you are looking at rocks on Earth, determining the exact chemical composition of a substance involves significant time preparing the sample and sophisticated laboratory equipment (and often significant money). Luckily, it is usually unnecessary to go to such lengths, because there are much easier ways that require little more than a magnifying lens and a penknife.
I am pretty sure the answer is <span>d. all of the above.
Hope this helps</span>
Answer:
over 4.5billion years ago is the answer
Explanation:
<span>A tsunami can occur when there is vertical movement at a fault under the ocean floor.</span>
Flash floods are dangerous because they usually take place clearly rapid because of heavy rain, rain from hurricanes, and many others. Like normal floods, flash flooding can damage houses and result in important flooding causing harm to vehicles, strength strains, and buildings. i'm hoping this facilitates!
A flood is an overflow of water onto land this is normally dry. Floods can happen almost anywhere. they could cowl a place with only a few inches of water or they could convey enough water to cowl the roof of a residence. Floods may be risky for communities, lasting days, weeks or sometimes even longer.
A flood occurs whilst water from a river , lake , or ocean overflows onto the land round it . an excessive amount of rain or melting snow are the principle reasons of floods . every so often the soil in the ground can make a flood worse. this is because whilst rain falls, the soil normally soaks it up like a sponge.
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