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.​