Tides

How many *low* tides are *in a day*?

*Two low tides* in a day

What is a *direct tide*?

The *direct tide* is the high tide on the side *facing the moon*.

What is a *tide cycle*?

The changing of tides through time. At any one time there are *two places with high tides* and *two places with low tides* on Earth.

What is a *Spring tide*?

The tide with the *greatest difference* between consecutive low and high tides.

What is a *Neap tide*?

The tide with the *least difference between consecutive low and high tides*.

What are the relationships between *Moon Phases* and *Tides*?

*New & Full Moon Phases* = *Spring Tides* *1st Quarter & 3rd Quarter Moon Phases* = *Neap Tides*

What is the difference between *Spring Tide* and *Neap Tide*?

*Spring tides* occur when *the sun and the moon are in line (180°) with the earth*. *Neap tides* occur when *the sun and the moon occur at right angles (90°) to the earth*.

How many *high* tides are *in a day*?

*Two high tides* in a day

How long is each *tide cycle*?

A *tide cycle* is *24 hours and 52 minutes long* (≈ one day). During this time, any point on the earth's surface experiences *two high tides* and *two low tides*.

What *causes* tides?

The force of gravity pulls the moon and Earth (including the water on Earth's surface) toward each other. Tides are caused mainly by *differences in how much the moon's gravity pulls on different parts of Earth*.

What is an *opposite tide*?

The *opposite tide* is the high tide on the side *facing opposite of the moon*.

What are *tides*?

The *periodic rise and fall* of the *level of water* in the ocean.