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.
Baseball is a popular Canadian sport originally made in the US.
<u>Answer:</u>
In a government, a 'loose alliance' of groups in which each member is working for its 'own benefit' is called a coalition.
<u>Explanation:</u>
- In politics, a coalition of parties is formed when a single political group or party fails to fetch the majority and take the mandate to itself.
- The seats secured by allied parties are shared to form a coalition in order to establish a stable government.
- All the parties in the coalition are benefited by the powers that they get to exercise for being a part of the government.
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Bolivia on the north-west and north, Brazil on the east, and Argentina on the south and south-west.
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Answer:
GIVEN AS BELOW.
Explanation:
Environmental geology is the study of the interaction of humans with their environment, including the biosphere, hydrosphere, and lithosphere, to minimize the possible damages that result in a modified environment. It studies rocks and minerals. Studies fossils and their traces.
The biosphere includes soil, rocks and biota, plant and animal life.
A tentative explanation builds on strong supporting evidence of a hypothesis.
