Weathering. the process by which rocks on or near Earth’s surface break down and change. Two Types of Weathering. Mechanical (Physical) Weathering – only a physical change takes place. Chemical Weathering – a chemical change takes place. Mechanical Weathering.
the process by which rocks on or near Earth’s surface break down and change
a physical change – the rock is simply broken down into smaller pieces
When water freezes its volume increases and as result of which the crack gets larger. In the morning the frozen water thaws and gives space to more water, which follows the same procedure.
Rocks and minerals undergo changes in their composition.
Atoms are rearranged into new compounds.
Agents of chemical weathering include water, oxygen, carbon dioxide, and acids.
Photograph taken in 1908 Photograph taken in 1968
What observations can you make that give you clues that a chemical reaction has occurred?
Change in color, change in temperature, bubbling or production of a gas