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 believe the correct answer from the choices listed above is option A. A new energy source found in the ocean that is currently very costly to obtain would be methane hydrates. Although the high cost, it <span>represents a potentially vast </span>methane<span> resource for both the United States and the world. Hope this answers the question.</span>
Sunlit zone is depth of water exposed to sunlight, trenches is a long narrow ditch.
Answer:
Greece's steep mountains and surrounding seas forced Greeks to settle in isolated communities. Travel by land was hard, and sea voyages were hazardous. Most ancient Greeks farmed, but good land and water were scarce. ... Many ancient Greeks sailed across the sea to found colonies that helped spread Greek culture.
Explanation:
The celestial equivalent of latitude is called declination and is measured in degrees North (positive numbers) or South (negative numbers) of the Celestial Equator. The celestial equivalent of longitude is called right ascension.
The Celestial Sphere :
North Celestial Pole (NCP) and the South Celestial Pole (SCP) - these are just the north and south poles extended into space.
Celestial Equator - The earth's equator, but at a much greater radius. ...
Horizon - The horizon changes depending on your position on earth.
I hope this helps
