Week 22 Review
Weathering-the breaking or wearing
away of rocks and mountains
Notice the difference in the height of the mountains.
Weathering-the breaking or wearing
away of rocks and mountains
Notice the difference in the height of the mountains.
Weathering-the breaking or wearing
away of rocks and mountains
Notice the difference in the height of the mountains.
Weathering-the breaking or wearing
away of rocks and mountains
The roots of plants
grow into cracks in
rocks and as they
grow the crack
becomes bigger until
the rock breaks.
Weathering-the breaking or wearing
away of rocks and mountains
The roots of plants grow
into cracks in rocks and as
they grow the crack
becomes bigger until the
rock breaks.
Weathering-the breaking or wearing
away of rocks and mountains
The roots of plants grow
into cracks in rocks and as
they grow the crack
becomes bigger until the
rock breaks.
Erosion-the taking away of small pieces of
rock, soil, or sand by wind, water, or ice
Rivers erode their banks and
beds by taking small pieces of
the soil and rock as it flows.
EROSION of a river bank
over MANY YEARS
Erosion-the taking away of small pieces of
rock, soil, or sand by wind, water, or ice
Example of EROSION by a river and ways to prevent the erosion
EROSION over
MANY YEARS
New plants
Rocks used to hold the
soil in place
The plants grow and
their roots help hold
the soil in place.
Erosion-the taking away of small
pieces of rock, soil, or sand by wind,
water, or ice
A V-shaped valley is
made by a fast moving
riVer.
Erosion-the taking away of small
pieces of rock, soil, or sand by wind,
water, or ice
U
A U-shaped valley is
formed by a slow moving
glaCier.
Erosion-the taking away of small
pieces of rock by wind, water, or ice
U
A U-shaped valley is
formed by a slow
moving glaCier.
Weathering and erosion can cause
the formation of caves or caverns,
arches, and rock stacks.
Weathering and erosion wear away
rock over time to form caverns.
Weathering and erosion wear away
rock over time to form arches.
Weathering and erosion wear away
rock over time to form rock stacks.
Deposition-the dropping of sediment
to create a new landform
The Mississippi Delta is formed
when the Mississippi River flows
into the Gulf of Mexico. The river
slows down as it meets the gulf
and the sediment it carries is
deposited in a new place making a
new landform-a delta.
The Mississippi River Delta is
shaped like a bird’s foot.
bird’s foot shape
Deposition-the dropping of sediment
to create a new landform
The Nile Delta is formed
when the Nile River flows
into the Mediterranean
Sea. The river slows down
as it meets the sea. The
sediment it carries is
deposited in a new place
making a new landform-a
delta.
The Nile Delta is shaped
like a triangle or a fan.
Erosion and deposition can move
sand and create sand dunes in a new
place.
Wind blows sand and
deposits it in a new area.
Formation of Fossil Fuels-Petroleum
(Oil) and Natural Gas
Formation of Fossil Fuels-Coal
When the plants
decompose a soft, spongy
substance called peat is
formed.
Sun, Earth, and Moon
The sun is a medium-size
star made of glowing
gases. It has an
atmosphere but not like
the atmosphere of Earth.
It is the center of our
solar system with 8
planets held in orbit by
tremendous gravity.
Sunspots are cooler than
the rest of the sun.
Sun, Earth, and Moon
Sunspots-areas
on the sun that
are cooler than
the rest of the
sun.
Sun, Earth, and Moon
Earth is the third planet from the sun. It is
made of rock. The Earth is the only planet
that has liquid water. Water covers ¾ of
the Earth’s surface. The atmosphere of
the Earth has the perfect combination of
gases to support life.
The Earth revolves around the sun in an
elliptical, or oval, orbit every 365 ¼ days.
The Earth rotates every 24 hours, causing
night and day.
The tilt of the Earth on its axis, the
imaginary line which goes through the
center of the Earth from north pole to
south pole, causes the four seasons.
Sun, Earth, and Moon
Sun, Earth, and Moon
The Earth revolves around the sun, the moon revolves around the
Earth, forming a system.
Sun, Earth, and Moon
The sun appears to rise in the east
and set in the west because of the
Earth’s rotation.
Sun, Earth, and Moon
The moon revolves
around the Earth every
29 days (approximately).
This revolution causes
the phases of the moon
to be seen on Earth.
Because the moon
rotates and revolves at
the same rate, we only
see one side of the
moon.
A full moon will be seen
every 29th day.
Sun, Earth, and Moon
SUN
EARTH
MOON
Made of glowing gases
Made of rock-does not
make light; only reflects
sunlight
Made of rock-does not
make light; only reflects
sunlight
Has an atmosphere
Has an atmosphere that
supports life
No atmosphere
Has gravity
Has gravity
Has gravity but much
less than Earth
Center of the solar
system
Orbits the Sun
Orbits the Earth
No liquid water
Has liquid water
No liquid water
Has sunspots-areas that
are cooler than the rest
of the sun
Has craters created by
asteroids hitting the
surface but not as many
as the moon due to
atmosphere
Has many craters
created by asteroids
hitting the surface