Tides

What causes the tides?

High Tides

● The gravitational pull of the Moon causes the tides.

● Water bulges on the side facing the Moon.● The Earth is pulled towards the Moon

leaving a bulge of water on the opposite side of the Earth.

Tides

● Areas that bulge are high tide.

● Other areas are experiencing low tide

The Tides

● Most places experience two high and two low tides each day

● Tides travel around the world in the same direction as the sun (east to west)

Tides

● The Bay of Fundy has the highest tides in the world.

● Which coast will have high tide first?

Which coast will have high tide first?

The East coast of Nova Scotia

Tidal Range

● Tidal range is the difference in height between high tide and low tide.

● If the coast is steep the tidal range will be large.

The Sun

● The Sun also influences the tides, but to a lesser degree than the Moon.

Spring Tides

● Spring tides occur when the gravity of the Moon and the Sun combine to pull the Earth's waters.

● Highest high tides and lowest low tides.

Neap Tides

● Neap tide occurs when the Moon and the Sun are at right angles to each other. Each pulling in different directions.

● Lowest high tide and highest low tide.

Electricity

● Tides can be used to generate electricity.

● During high tide water is trapped by the dam.

● During low tide water rushes out, spinning turbines which create electricity.

Tides

Draw a diagram of Spring tide and a diagram of Neap tide.