it's not really physics it's science but they didn't have a subject for that, anyway the question is.....

the illustration shows how sonar can be used to study the deep ocean which type of waves does sonar use?

I attached the picture

​

In which layer of the atmosphere is the ozone layer located?

The __________________ is a network of cells and fibers that send messages to different parts of the body.

A.
endocrine system

B.
nervous system

C.
skeletal system

D.
muscular system

There are many uses for permanent magnets and temporary magnets like an electromagnet. Electric appliances with electric motors use magnets to turn electricity into motion. Other examples include electric toothbrushes, fans, lawnmowers, and anything else containing a motor.
Magnets are used to hold doors closed, such as in refrigerators, kitchen cabinets and others. Magnets are also used to read and write data on a computer's hard drive or on old-fashioned cassette tapes. There are more magnets in headphones and stereo speakers which help to turn stored music back into the sounds you can hear.
In summary, magnetism is another property of some kinds of matter. There are two poles to a magnet, the south pole and the north pole. Like poles repel and unlike poles repel. There are two different kinds of magnets, temporary and permanent. A temporary magnet can be made by using electricity. All magnets contain an invisible electromagnetic field which surrounds the magnet. There are many uses for magnets, from holding doors closed to helping music sound better with the magnets inside of speakers.

Based on the information provided above how would you describe a magnet?

kmomomjnimimioninjknjknk

Caleb is investigating the effect of friction on the motion of an object. He uses the following supplies for the investigation:

a wooden block
three ramps, each ramp is the same height and length but has a different surface (smooth wood, carpet, rough sandpaper)
a stopwatch
Caleb tests his hypothesis that the smooth wood ramp surface causes less friction than the carpet and that the carpet causes less friction than the rough sandpaper.
(THERE IS A PART "A,B,C")