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EXPLAIN IN COMPLETE SENTENCES

WHAT IS THE SYSTEM MOON - EARTH

The Sun-Earth-Moon The Sun-Earth-Moon SystemSystemRotationRotation

Coriolis EffectCoriolis EffectTidesTides

RevolutionRevolutionSeasonsSeasons

MoonMoonLunar EclipseLunar EclipseSolar EclipseSolar Eclipse

RotationRotation Earth is a round, Earth is a round,

3-dimensional sphere3-dimensional sphere

AXISAXIS – imaginary – imaginary vertical line around vertical line around which earth spinswhich earth spins

23.5 ° from vertical23.5 ° from vertical

23.5 °

RotationRotation

ROTATIONROTATION – –

the spinning of Earth the spinning of Earth around its axis around its axis

RotationRotation

Effects of Effects of ROTATIONROTATIONNight and day – Night and day –

plants, animals, and plants, animals, and peoplepeople

Daily change in Daily change in temperaturetemperature

Effects of Effects of ROTATIONROTATION

Earth bulges Earth bulges at the equator at the equator

Polar diameter – 7900 miles (12,714 km)Polar diameter – 7900 miles (12,714 km)Equatorial diameter – 7927 miles (12,756 km)Equatorial diameter – 7927 miles (12,756 km)

How fast is the Earth spinning around How fast is the Earth spinning around its axis?its axis?At the equator, the Earth's surface At the equator, the Earth's surface

moves 40,070 kilometers in 24 hours. moves 40,070 kilometers in 24 hours. That is a speed of about 1040 miles/hr That is a speed of about 1040 miles/hr (1670 km/hr or 0.5 km/sec).(1670 km/hr or 0.5 km/sec).

[This is calculated by dividing the circumference of [This is calculated by dividing the circumference of the Earth at the equator (about 24,900 miles or the Earth at the equator (about 24,900 miles or 40,070 km) by the number of hours in a day (24).] 40,070 km) by the number of hours in a day (24).]

As you move toward either pole, this As you move toward either pole, this speed decreases to almost zero (since speed decreases to almost zero (since the circumference of the spinning circle the circumference of the spinning circle at the extreme latitudes approaches at the extreme latitudes approaches zero).zero).

RotationRotation

Effects of ROTATIONEffects of ROTATION

CORIOLIS EFFECTCORIOLIS EFFECT• Earth rotates at different speeds at different Earth rotates at different speeds at different

latitudeslatitudes• Any moving solid, liquid , or gas is turned to Any moving solid, liquid , or gas is turned to

the the RIGHT RIGHT of its intended path in the of its intended path in the NorthernNorthern Hemisphere Hemisphere

• Any moving solid, liquid , or gas is turned to Any moving solid, liquid , or gas is turned to the the LEFT LEFT of its intended path in the of its intended path in the SouthernSouthern HemisphereHemisphere WindsWinds Ocean currentsOcean currents

RotationRotation

Effects of ROTATION

Effects of ROTATION

CORIOLIS EFFECT

CORIOLIS EFFECT

Effects of Effects of

ROTATIONROTATION

CORIOLIS EFFECT

CORIOLIS EFFECT

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Effects of ROTATIONEffects of ROTATION

TidesTides The gravitational pull The gravitational pull

of the moon and the of the moon and the sun produces a sun produces a rhythmic rise and fall rhythmic rise and fall of the oceans as the of the oceans as the Earth rotatesEarth rotates

RotationRotation

Result of the gravitational attraction Result of the gravitational attraction between the Earth, sun, and moon. between the Earth, sun, and moon.

As the moon rotates around the Earth, it As the moon rotates around the Earth, it pulls the water on the nearest side of the pulls the water on the nearest side of the Earth outward into a bulge. Earth outward into a bulge.

A similar bulge on the opposite side of the A similar bulge on the opposite side of the Earth is caused by inertia - gravitational Earth is caused by inertia - gravitational attraction of the moon is less water attraction of the moon is less water furthest away than on the Earth. furthest away than on the Earth.

TidesTides Effects of ROTATION

Effects of ROTATION

NEAP TIDE

SPRING TIDE

TIDESTIDES

TIDESTIDES

SPRING TIDE During time of the new moon During time of the new moon

and full moon, the sun and and full moon, the sun and moon are in a straight line moon are in a straight line

Combined gravitational pull Combined gravitational pull produces spring tides produces spring tides

High tides are very high and low High tides are very high and low tides are very low.tides are very low.

NEAP TIDE When sun and moon When sun and moon

are at right angles from are at right angles from the Earth, during the the Earth, during the quarter phases of the quarter phases of the moonmoon

Gravitational pull on the Gravitational pull on the oceans is less oceans is less

A smaller difference A smaller difference between high and low between high and low tidetide

TIDES

TIDES

TIDES

TIDES Nova Scotia's Hall's Harbour at high tide.

The tides have a The tides have a vertical difference, vertical difference, between high and between high and low tide, of up to low tide, of up to

14 metres (48 14 metres (48 feet)! feet)!

And at low tide just six hours later.

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