The ozone layer is a thin part of the Earth's atmosphere that absorbs almost all of the sun's harmful ultraviolet light. Ozone holes are popular names for areas of damage to the ozone layer. The Ozone layer damage is more like a really thin patch than a hole.
Mechanical weathering breaks rocks into smaller pieces without changing their composition. Ice wedging and abrasion are two important processes of mechanical weathering. Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.
Deposition is the laying down or settling of eroded material. Sediment deposited in water typically forms layers called beds.
Electricity is used to move DNA molecule fragments through the agarose gel. This technique has lots of applications.
