2 · en
Short, simple sentences with “predominates”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Most metals are not found "free" in nature. What does this mean? Well, they are usually found mixed or combined with other substances, which are generally called "minerals" (rocks in which a certain substance predominates).
Originally these minerals, such as coal, oil and gas, were living organisms that over millions of years were buried underground and weighed down by layers and layers of materials. They lost the water they contained and were reduced to mineral substances, in which carbon predominates.
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