What Is Weathering? Weathering is the process that breaks down rocks into smaller and smaller pieces Weathering wears down mountains and breaks down statues.

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Presentation transcript:

What Is Weathering? Weathering is the process that breaks down rocks into smaller and smaller pieces Weathering wears down mountains and breaks down statues

What Is Weathering? There are two types of weathering: mechanical and chemical weathering

What Is Mechanical Weathering? It breaks apart rocks without changing them chemically There are 5 types

What Is Mechanical Weathering? Rocks formed under pressure expand and contract when pressure is released

What Is Mechanical Weathering? Ice Wedging occurs when water seeps into cracks in rock & freezes…the rock expands and finally breaks This type of weathering causes potholes in the road

What Is Mechanical Weathering? Abrasion is the collision of rocks with one another & agents such as gravity, water & wind

What Is Mechanical Weathering? Organic Activity known as root pry As roots of plants can work their way into cracks of rock and break them apart

What is Mechanical Weathering? Temperature changes from hot to cold may aid in weathering Rocks expand in hot weather and contract in cold

What Is Chemical Weathering? It breaks apart the rock when substances chemically react with the minerals in the rock, changing it into a different substance. There are 4 types of chemical weathering

What Is Chemical Weathering? Hydrolysis –minerals change into new compounds when exposed to water

Oxidation –Oxygen combines with minerals What Is Chemical Weathering?

Carbonation –change in minerals when they react with carbonic acid…CO2 + water –Dissolves limestone forming caves

What Is Chemical Weathering? Decaying Plants –Produce acids that break down rocks –Especially mosses and lichens

What Affects the Rate of Weathering? Rock Composition: igneous and metamorphic rock weather more slowly Amount of Exposure: the longer a rock is exposed the faster it will weather

What Affects the Rate of Weathering? Climate: variable weather conditions accelerate weathering processes Topography: on steep slopes, rocks are weathered more quickly