Today’s Agenda…1/18 Bellringer: How do weathering and erosion change the surface of the Earth? Turn in review worksheets Notes on Constructive and Destructive Forces Before/After Assignment

Weathering What is weathering? What are the two types of weathering? Give an example of mechanical weathering. Give an examples of chemical weathering.

Erosion What is erosion? What are the agents of erosion?

Forces that shape our Earth Science 6

Today’s Goals… I can describe constructive and destructive forces I can identify examples of constructive and destructive forces

Think about it! How is the surface of the Earth changing everyday?

Forces The surface of the Earth is constantly changed by constructive and destructive forces

Constructive Forces Build up the Earth’s surface Types of constructive forces: Crustal deformation Volcanic eruptions Deposition of sediment

Crustal Deformation The movement of plates builds landforms such as volcanoes and mountains

Volcanic Eruptions As lava erupts onto the Earth’s surface it cools to form new layers of rock which build up the Earth’s surface

Deposition of Sediments As sediments are carried away and laid down they build up landforms Example: Sand dunes

Destructive Forces Wear down Earth’s surface Types of destructive forces: Weathering Erosion

Homework… You are going to draw a before and after picture of a landscape At least one constructive OR destructive force will cause a change in your landscape over time The before picture shows what the landscape first looked like The after picture shows what it looked like after the constructive or destructive force changed it

Homework… Write 1 paragraph to explain what happened to your landscape over time and what caused it to change You will want to include terms such as: constructive force, destructive force, erosion, weathering, volcanic eruptions, deposition, crustal deformation, plate movement