4 ErosionThe removal of rock particles by wind, water, ice, or gravity.
5 How fast can it fizz? Place a “rock” into the first beaker Crush a second “rock” and place it into the second beakerAdd the water to the beaker with the full rock. Time how long it takes for the “rock” to dissolve.Add the water to the beaker with the crushed “rock.” Time how long it takes to dissolve.
6 How fast can it fizz?Which dissolved faster, the whole “rock” or the crushed “rock?”What variable affected how long it took each of them to dissolve?
8 Mechanical Weathering Rock is physically broken into smaller pieces.These rocks have the same composition as the rocks they came from.
9 Causes of Mechanical Weathering Ice wedging – freezing and thawingCauses potholes on streets
10 Causes of Mechanical Weathering Release of pressure - erosion removes material from surface, pressure is reduced. Pressure release causes rock to crack.
11 Causes of Mechanical Weathering Plant growth – roots of trees and other plants enter cracks in rocks.
12 Cause of Mechanical Weathering Actions of animals – animals that burrow in the ground loosen and break apart rocks in the soil.
13 Cause of Mechanical Weathering Abrasion – the grinding away of rock by rock particles carried by water, ice, wind, or gravity.
14 Chemical WeatheringThe process that breaks down rock through chemical changes.Produces new minerals.
15 Cause of Chemical Weathering Water – dissolves rockWater is the most important cause of chemical weathering
16 Cause of Chemical Weathering Oxygen – rust!!Iron combines with oxygen in the presence of water in a process called oxidation
17 Cause of Chemical Weathering Carbon Dioxide – dissolves in rain waterEasily weathers rocks such as marble and limestone
18 Cause of Chemical Weathering Living Organisms – plants produce weak acids
19 Cause of Chemical Weathering Acid Rain – how is it formed?Coal, oil, and gas is burned for energyThese fuels pollute the air with sulfur, carbon, and nitrogenThese compounds react with rainwater, forming acid rain.
22 Rate of Weathering Type of Rock Climate The minerals that make up rock determine how fast it weathers.Marble vs. graniteClimateFaster in wet climatesChemical reactions occur faster at higher temperatures