grade 3 science lesson

3. Landforms
The crust is a layer of rock on
the outer surface of Earth .
The crust covers all of Earth.
The crust has different shapes,
like mountains, hills, and valleys.
Landform is a solid feature of
.Earth`s crust

4. Landforms are constantly changing.
Changes happen quickly. During
landslides, rocks and earth move
rapidly down a slope.
Changes happen slowly.
Mountains can take millions of
. years to form

5. Butte landform

6. Features on Earth`s
Surface
Bodies of water are another
type of feature found on
Earth`s surface.
Moving water is one of many
.forces that can shape landforms

7. Rivers can act like saws, cutting
through rock.
Flooding rivers deposit
sediments on their banks.
Ocean waves break apart rocks
.and move sand

8. Glacier
Glacier is a large, moving body of
ice. It forms in cold places where
snow and ice pile up year after
year. . It slowly moves downhill

9. Valley
Valley is a low, narrow area
between hills or mountains.
Rivers and glaciers can cut
.valleys into the land

10. Platea
u
Plateau is a plain that is higher
.than the land around it

11. Volcano
Volcano is an opening in Earth`s
crust. Pressure inside Earth can
force hot, melted rock up
.through the volcano

12. Mountain
Mountain is a landform high
above the land around it. Some
mountains form when blocks of
rock are pushed up or drop down
along . cracks in Earth`s crust

13. Lake
Lake forms when the flow of
water slows enough to fill an
.area

14. Hill
Hill is a high place on Earth`s
surface, but not as high as a
mountain. Hills often have
. rounded tops

15. Plain
Plain is . a large, mostly flat area

16. River
River is a large natural stream of
.water

17. Coast
The coast is land next to the
ocean. The movement of ocean
.water helps shape the coastline

18. Ocean
The ocean is the salt water that
covers almost three-fourths of
.Earth`s surface

19. Rapid changes
to Earth`s
surface

20. Volcanoes
Mantle is the layer below
Earth`s crust from which
volcanoes begin.
Magma forms is the melted
.rock

21. 1
2
3
Magma collects in a pocket called
a magma chamber.
Magma pushes up through weak
spots in the crust.
Magma erupts through a bowl-shaped
crater.
Lava is the magma that flows onto
Earth`s surface.
4
The lava cools and hardens,
. forming igneous rock

22. Flowing lava can . burn everything in its path

24. Lava 4 Crater 3
magma pushes upward crust 2
Magma chamber 1

25. Earthquakes

26. Earth`s crust is broken into
large sections or parts. These
parts move very slowly.
Sometimes parts of the
crust can shift suddenly.
The sudden shift can send
vibrations through Earth.
These vibrations may shake
.the ground in all directions

27. Most earthquakes happen along
faults, or large cracks in the
crust.
An Earthquake`s shaking can
make new cracks appear in
Earth`s surface.
It . can also cause landslides