EARTH’S CHANGING SURFACE

Today I can describe the role that water plays in erosion, deposition and weathering.

SLOW CHANGESThe earth’s surface is constantly changing slowly by weathering.

Physical Weathering: For example, mountains can rise where there was once flat land. (wind erosion)

Physical Weathering: Rocks are changed into bits of sand and soil from wind, crashing waves, and freezing water. (wind and water erosion and temperature)

Physical Weathering: Some changes happen so slowly, you may never see them (i.e. it took 6million years for the Colorodo River to carve the Grand Canyon).

Physical Weathering: Plate Tectonics: the movement of plates under the earth’s surface.

Chemical Weathering: acid rain and rust

FAST CHANGES• The earth’s surface can also

weather quickly. • Storms can bring dangerous

weather causing fast changes in the earth.

• For example: tornadoes, hurricanes, avalanche, earthquakes, etc.

VOCABULARYWeathering- the breaking down and wearing away of rocks into smaller pieces.water- minerals in rocks dissolve in water. Moving water carries rough pieces of sand that can chip rocks away.

wind- contains sand and wears away rock.

ice- liquid water collects in cracks in a rock. When the water freezes, it expands, pushes apart the rock, and breaks it.

plants- sprout from the cracks in a rock. It’s roots spread inside the crack, and pushes it apart.

Vocabulary continued...Erosion- carries weathered materials away from a place (wind, water, glacier)

Deposition- drops the materials in a new place.

Erosion and deposition destroy old landforms and create new ones.

Moving water, wind, and ice (from weathering) cause erosion and deposition.

Recap!* Fill in the blank with a partner from your table group. Ready, Set, Recap!

The breaking down of rocks is called____________ .

__________ carries weathered materials away from a place.

__________ drops the materials in a new place.

Make a T-chart and write examples of slow and fast changes caused by weathering.

Let’s Explore!!!Please listen carefully to the following directions:

We are going to go outside and observe our school to find examples of weathering, erosion and deposition.

You will be drawing and writing examples of weathering, erosion and deposition you see.

Please bring your science spiral and a pencil.

When students return we will share observations from school property.

Quietly line up at the door!

Closure

Please state today’s objective in your own words.

In your science journal write summary (20 words) telling me what weathering, erosion and deposition are.