Download
1 / 8
80 likes | 224 Views
Tides. SPI 0607.6.5. You arrive at the beach and set up your blankets a few meters from the ocean. As time passes you notice that the water is now closer to you. In a few hours the water will begin to head the other way. The rise and fall of the ocean are called tides.
E N D
Tides SPI 0607.6.5
You arrive at the beach and set up your blankets a few meters from the ocean. As time passes you notice that the water is now closer to you. In a few hours the water will begin to head the other way.
The rise and fall of the ocean are called tides. • This cycle repeats day after day. • The greatest rise of water is called a high tide. • The greatest fall of water is called a low tide. • Gravity causes tides. Gravity is the pull that exists between all objects. Earth’s pull on the moon and keeps it circling around the planet. • The moons gravity pulls on Earth’s water. Even on puddles and ponds. But the effect ob small bodies of water is so slight that we do not notice it. We notice tides mainly on ocean shores and very large lakes.
The part opposite the moon has a high tide. This is because Earth’s land is pulled by the moon away from the water on this side. • During high tide water reaches its highest level along a shore. • During low tide water reaches its lowest level along shore.
As Earth rotates on its axis, different parts face toward the moon. The part of Earth that faces the moon at that time is pulled toward the moon. This part has a high tide. After 6 hours the part that was having high tide now has low tide. It does this every 6 hours. Meaning there are 2 high tides and 2 low tides during 1 day.
Spring Tide • Twice a month the sun, the moon, and Earth line up with each other. So the gravitational pull on Earth of the sun and moon combine for a bigger effect on Earth’s water and land. The strong pulls makes high tides rise higher than normal. • Spring Tide- is a strong tide produced with the sun, Earth, and moon are lined up. • These happen during a full and new moon phases. • Spring tides have the greatest different between high and low tide.
Neap Tide • The smallest difference between the height of a high tide and the height of a low tide happen when the sun, Earth and moon are at right angles. • In this position the suns gravity does not add to the moons gravity. • Neap Tide- is a weak tide produced with the sun, Earth, and moon are at right angles. • These tides take place during the quarter moon phases. • During a neap tide the high tide is lower than normal and the low tide is higher than normal. • Neap tides have the least difference between high and low.
