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Biology, 04.06.2021 22:30 brillamontijo
Which of the following describes the difference between surface mining and sub-surface mining?
1. Surface mining injects chemicals into the rock, and sub-surface mining creates tunnels deep into the Earth.
2.Surface mining creates tunnels deep into the Earth, and sub-surface mining digs large holes at Earth's surface.
3.Surface mining dig's large holes at Earth's surface, and sub-surface mining creates tunnels deep into the Earth.
4.Surface mining creates tunnels deep into the Earth, and sub-surface mining injects chemicals into the rock.
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Which of the following describes the difference between surface mining and sub-surface mining?
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