about tides

1. TIDES
BY: IDA JESSIKA
GRADE 7

2. WHAT ISATIDE ?

3. TYPES OF TIDES

4. WHAT CAUSESTHEM TO OCCUR ?
• The Moon’s gravitational pull on the Earth and the Earth’s rotational force are the two
main factors that cause high and low tides. The side of the Earth closest to the moon
experiences the Moon’s pull the strongest,and this causes the seas to rise , creating
high tides.

5. WHEN DO THEY OCCUR

6. SPRING AND NEAP TIDES

7. HOW OFTEN DO THEY OCCUR ?
The Earth rotates through two tidal “bulges” every lunar day, coastal areas
experience two high and two low tides every 24 hours and 50 minutes. High tides
occur 12 hours and 25 minutes apart.

8. TYPES OF TIDES
Name the time measuring device