Question

What type of instruments have been used to measure the depth of the mantle?

instruments that detect heat
instruments that measure pressure
instruments that detect earthquakes
deep oil wells

Answer 1

Idk, Sorry!

Answer 2

im here

Answer 3

sure

Answer 4

C

Answer 5

thank you

Answer 6

The earth conducts seismic waves-- when an earthquake occurs, stations farther and farther away from the quake see the S and P waves propagated through deeper and deeper layers. By measuring the arrival time of the waves, the velocity of the waves can be found as a function of depth. There is clear evidence for several layers in the earth which both refract the waves and below which the velocities are different. This is a bit like holding a book under your desk while a friend (gently) taps the other end of the desk. If you listen closely to the sound (i.e. with your ear on the top of the desk) the sound changes noticeably if a large book is pressed up against the bottom of the desktop. You might also try to figure out how to tell if a golf ball is wound, liquid filled or solid-- without looking at it

Answer 7

Scientists learn about the layers deep within the Earth's crust by studying how seismic waves travel through the Earth.If there is an earthquake somewhere, seismagraphs in many locations will record it. By looking at the time of arrival of the main set of waves, and how the frequencies of the waves are arranged within the set, scientists can learn about the density and other properties of the layers. The relative differences in arrival times of the S and P seismic waves at several recording stations tell scientists about the different speeds those waves were traveling at, which in turn gives information about the density of the material the layer is made of, and how thick the layer is in several directions.
If you line up a rod of metal and a wooden dowel, and hit one end of each with a hammer and press your ear to the other end. Does the sound wave reach the other end of each rod at the same time? If you can find rods that are the same size but of different metals (or maybe try plumbing and electrical conduit pipes, which you can probably find in steel, copper, and maybe galvanized aluminum) hit one end of each with a hammer. Do they ring at the same frequencies? Why or why not?

Answer 8

WELCOME!!