1. Moon and Suns effect on the oceans
Tides
Moon and Suns effect on the oceans

2. How Tides are Created
Tides are the regular rise and fall of ocean surfaces caused by the gravitational forces of the Moon and the Sun.
Gravity is a major force responsible for creating tides. Inertia, acts to counterbalance gravity.
It is the tendency of moving objects to continue moving in a straight line.Together, gravity and inertia are responsible for the creation of two major tidal bulges on the Earth.
The Moon has a stronger effect on tides than the Sun. The Sun is much farther away, its gravitational force is nearly the same on the near side as the far side of the Earth.
The Sun’s gravity on the Earth is over 100 times stronger than Moon’s gravity.
The moon is much closer to the Earth causing a greater difference between its pull on the near side and its pull on the far side of the Earth.
The difference in gravitational pulls is what causes tides, not the overall force.

3. Gravity and inertia act in opposition on the Earth’s oceans, creating tidal bulges on opposite sites of the planet.
On the “near” side of the Earth (the side facing the moon), the gravitational pull of the moon pulls the ocean’s waters toward it, creating one bulge. On the far side of the Earth, inertia dominates, creating a second bulge.

4. Spring tide
Neap tide

5. Spring Tides
When the Sun and Moon are aligned, on the same side or opposite sides of the Earth, their combined gravitational pull causes unusually high and low tides. Known as a spring tide.
During this time high tides are very high and low tides are very low.
High tide
Low tide

6. Neap tides Are "weak" tides
When the Sun and moon are at the right angles to each other with respect to the the Earth, the gravity of the Sun competes with the gravity of the Moon causing a smaller difference between high and low tides. This is known as a neap tide.

7. Bay of Fundy high and low tide

8. Longer days
The Earths rotation has gradually slowed over time, the reason is the tides.
The Moon's gravity pulls back on the tidal bulge which slows the Earths rotation and lengthening the day.
The effect is tiny, every century the length of a day increases by about 1.7 milliseconds.