UCSB Science Line
Sponge Spicules Nerve Cells Galaxy Abalone Shell Nickel Succinate X-ray Lens Lupine
UCSB Science Line
Home
How it Works
Ask a Question
Search Topics
Webcasts
Our Scientists
Science Links
Contact Information
Why does the ocean seem to rise at night time?
Answer 1:

The ocean has tides, which are periods of high water twice a day alternating with periods of low water twice a day. Each full tide (high + low tide) takes about 12 hours. So, at night time, actually, both high and low tide occur. It's likely that during the times that you've observed the ocean at night, it has been high tide, but it's not always the case. The tide is caused by the gravitational pull on the oceans from the moon and the sun.



Click Here to return to the search form.

University of California, Santa Barbara Materials Research Laboratory National Science Foundation
This program is co-sponsored by the National Science Foundation and UCSB School-University Partnerships
Copyright © 2015 The Regents of the University of California,
All Rights Reserved.
UCSB Terms of Use