| Diagram
that accompanied marking guide: |
Tides
are caused mainly by the moon. When the moon is overhead, its gravity
pulls upwards on the sea, pulling it away from the shore, causing
a bulge.
Tides rise and fall twice in 24 hours 50 minutes. This is because
of the gravitational pull which creates two high tides and two low
tides at any one time during the course of the 24 hours. The extra
50 minutes is due to time it takes the moon to move in its own orbit
around Earth. |
 |
| “tides
operate on a 12+ hour cycle = 2 x low & high tides in 24 hours”
would be an example of an ‘any other response’. |
|
