Forces That Change Our World

1
Forces That Change Our World

• Students will identify surface features of the
  Earth caused by constructive and destructive
  processes.
• Identify surface features caused by constructive
  processes.
• Deposition (Deltas, sand dunes, etc.)
• Earthquakes
• Volcanoes
• Faults
• Identify and find examples of surface features
  caused by destructive processes
• Erosion (waterrivers and oceans, wind)
• Weathering
• Impact of organisms
• Earthquake
• c. Relate the role of technology and human
  intervention in the control of constructive and
  destructive processes. Examples include, but are
  not limited to
• Seismological studies, Flood control,
  (dams, levees, storm drain management, etc.)
  Beach reclamation (Georgia coastal islands)

2
I am a force that wears away soil during a
rainstorm. What am I?

• Water

3
I am the process of breaking down rock into
smaller pieces. What process am I?

• Weathering

4
I am a huge sheet of ice that scrapes away tops
of mountains. What am I?

• Glacier

5
I seep into rock cracks and crevices as water.
When the weather drops below 32 degrees, I have
the power to split a rock in two. What am I?

• Ice

6
I am the process of movement. I move material
from one place to another. What process am I?

• Erosion

7
I am usually at work in the desert. I use sand
to grind rock into dust. What am I?

• Wind

8
Once material has been moved, it sometimes gets
dropped off. This process is my name. What
process am I?

• Deposition

9
True or False. Weathering always happens before
Erosion.

• False. For example, while wind erodes sand
  across the desert, it grinds against rock
  formation and weathers it at the same time.

10
Deltas are formed when rivers flow towards the
sea carrying soil, rock, and sediment. These
materials sink to the bottom of the river and
over time form new land. Deltas are formed by
the process of _______.

• Deposition

11
True or False. In order for material to be
depositioned, it must be eroded first.

• True. Deposition is when material is dropped off
  in another place after being moved.

12
True or False. Gravity can act as an eroding
process.

• True. The force of gravity can pull rock and
  debris from higher places to lower places.

13
Mount Rushmore is carved in stone. Ice has
frozen in cracks and damaged some of the
structure. What process is this?

• Weathering

14
Stone Mountain, GA was once underground.
Gradually the land was worn away that covered the
granite underneath. The granite rock expanded
forming cracks. Huge slabs of rock broke off,
leaving a smooth surface. What two agents wore
most of the soil away?

• Wind and water

15
Rainbow Bridge is a natural wonder. The bridge
was probably formed by what two things?

• Wind and sand
• Wind and water

16
As the ocean pounds away at seaside cliffs, rock,
sand, and soil is washed away. This is an
example of ____________.

• Weathering

17
Mass movement is erosion on a very large scale.
Name two examples of mass movement from the
chapter.

• Mudslides, Landslides, creep, sinkholes

18
In the dust bowl of the early 1900s, wind blew
up to 3 feet of soil away. This was an example
of ____________.

• Erosion

19
Explain the difference between weathering and
erosion.

• Weathering is breaking down rock.
• Erosion is moving it.

20
Stone Mountain, GA was once underground.
Gradually the land was worn away that covered the
granite underneath. The granite rock expanded
forming cracks. Huge slabs of rock broke off,
leaving a smooth surface. What probably caused
the huge slabs to break off?

• Ice expanding the cracks

21
Think about what you know of human activities.
What types of human activities increase the
amount of erosion that takes place?

• Tilling soil for farming loosens it so the wind
  and water can erode it.
• Land developers clear land to build cities and
  housing developments.