The largest expanse of time on the geologic time scale is the eon. An eon is known to be a unit of geological of time in which this is equivalent to billions of years in which gave it the title of having to be the largest expanse of time in regards with the geologic time scale.
Earth's crust is a dynamic place. Volcanic eruptions, erosion, and large-scale movements of the continents rework the surface of our planet constantly. Plate tectonics is the scientific theory explaining the movement of the earth's crust. It is widely accepted by scientists today. Recall that both continental landmasses and the ocean floor are part of the earth's crust, and that the crust is broken into individual pieces called tectonic plates.
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The correct answer is ores. A mineral or combination of minerals that contains metals or other substances in usable amounts is called an ore. An ore is basically a rock that contains minerals that have important elements including metals.
