convection current def & images
-Convection means the transfer of heat by the mass movement or circulation of a substance.
-A convection current is the transfer of heat by the mass movement of heated particles into an area of cooler fluid.
-Physics
a. Heat transfer in a gas or liquid by the circulation of currents from one region to another.
b. Fluid motion caused by an external force such as gravity.
- Meteorology The transfer of heat or other atmospheric properties by massive motion within the atmosphere, especially by such motion directed upward.


convection_current.JPG
convection_current.JPG



wiki post mech chem weathering images
-Chemical Weathering- the process by which rocks are decomposed, dissolved or loosened by chemical processes to form residual materials.
-The weatheing is Chemical beause the rock is being
oxidated
external image weathering_img3.gif
-Mechanical Weathering- the erosion or breakdown of rock into smaller fragments by natural physical agents with no chemicals involved.
-The crack was caused by the force of nature.
Mechanical Weathering
Mechanical Weathering