What are soil horizons How are the soil

• What are “soil horizons”? • How are the soil horizons arranged from top to bottom? • Soil horizons: Layers of soil • O, A, B, C

Occurs when physical processes break rock into smaller pieces without changing the rock’s chemical composition

Constant freezing and thawing of water

Responsible for the formation of caverns

What type of mechanical weathering is most common in mountainous regions?

When water freezes, its volume __________

Rounding of corners and edges of blocks of rocks Mechanical or Chemical?

Changing chemical composition What type of weathering?

What would cause gravestone inscriptions (writings) to become harder to read over time?

What type of climate would chemical weathering be most effective?

Which rock type would have the fastest rate of weathering?

Well developed soil has clear layers called _____

A soil’s texture is determined by ________

Main source of organic matter in soil

Which soil horizon is the uppermost layer (not including the O layer)

Which horizon is made of parent material (bedrock)?

Which soil horizon is made up of subsoil (mineral content)?

Soil that is characteristics of the Eastern US?

Compared to the past, rates of soil erosion have ______

What factors does the rate of soil erosion depend on? Hint: There are 4 of them!

The amount of sediments carried by rivers has _____ since humans have appeared.

Process responsible for moving material downslope under the influence of gravity

Force behind mass movements

When a block of material moves downslope

Tree roots lifting and cracking a sidewalk Mechanical or Chemical?

When rocks hit against other rocks causing breakage (be specific)

Force that causes the most erosion in desert areas

Mounds of silt

Type of weathering that took place when the TUMs tablet was broken into small pieces in the lab

Soil with the largest particles and coarse texture

Fine grained soil that holds water well