In science class, we will continue our work with waves, currents, and tides. Your notes we took last Monday will be your study guide for the test you will be having on Friday. Here is another copy just in case you need it:
What are currents?
—A current is a
movement of water that follows a regular pattern
Why do currents
follow a path?
1. Weather
—Global winds blowing across the ocean cause
surface currents
2. The
Earth’s Rotation
—Coriolis Effect- The earth’s rotation causes
currents in the northern hemisphere to turn clockwise and currents in the
southern hemisphere to turn counter clockwise.
3. Position
of the continents
—As currents approach continents, they are
deflected (change direction)
But what about
currents deep within the ocean?
—Deep currents are
caused by changes in density.
—Changes in temperature and salinity causes
deep water currents to move deep under the ocean.
How do currents
affect the climate?
1. Warm Water Currents
—Create warmer climates in coastal areas that
would otherwise be much cooler
2. Cold
Water Currents
—Create cooler climates in coastal areas that
would otherwise be much warmer
What causes waves?
—Waves are caused when wind blows across
the water’s surface and transfers
energy to the water.
—The waves move across water, but the water
below it actually stays in place.
What are some
different types of waves?
1. Open Ocean Waves
—Happen far out in
the deep ocean.
2. Tsunamis
—Waves that from when a large volume of water
is suddenly moved up and down.
3. Storm
Surges
—A rise in sea level near the shore caused by
strong winds associated with a storm
4. Longshore
- when waves hit the shore at an
angle, it causes water to move along the shore in a current
—Erodes beaches and
transports pollution
What are tides?
—Daily changes in the
level of ocean water.
What causes tides?
—Tides are influenced
by the gravitational pull of the sun and the moon.
What are the
different types of tides?
1. High tide
occurs on the part of the Earth that is
closest to the moon. A matching high tide will be happening on the opposite
side of the earth.
2. Low
tide
Occurs on the part
of the earth that is a right angle from the moon.
3. Spring
Tides
Tides with the
largest daily tidal range.
Occur during new and
full moons (every 14 days)
4. Neap
Tides
Tides with the smallest daily tidal range
Occurs when sun,
Earth and moon form a 90
degree angle.
Happen halfway
between Spring Tides
A few other notes about this week:
1. It is Dollars for Disasters Week! Bring in some loose change you wish to donate to the Red Cross. The classroom that raises the most amount of money will will a pizza party from Ms. Carla.
2. Parent/Teacher conferences start this week. If you need a reminder of when your conference is scheduled, please see me ASAP.
3. A PTA meeting will take place this Thursday in the MRP at 6:30. I'd like to see you there!
4. Friday is a dress-down day! Hooray!
Everyone have a wonderful week,
Mr. Trent
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