Question

Which have scientists learned from studying seismic waves that travel through earth’s interior?

A.
The outer core of earth is solid.

B.
They have learned the precise depths where the boundaries between the earth's layers are located.

C.
The inner core of earth is liquid.

D.
Earth's mantle is liquid.

Answer 1

plz help i will fan you and give you a medal

Answer 2

Seismic waves travel fast, on the order of kilometers per second (km/s). The precise speed that a seismic wave travels depends on several factors, most important is the composition of the rock. We are fortunate that the speed depends on the rock type because it allows us to use observations recorded on seismograms to infer the composition or range of compositions of the planet. But the process isn't always simple, because sometimes different rock types have the same seismic-wave velocity, and other factors also affect the speed, particularly temperature and pressure. Temperature tends to lower the speed of seismic waves and pressure tends to increase the speed. Pressure increases with depth in Earth because the weight of the rocks above gets larger with increasing depth. Usually, the effect of pressure is the larger and in regions of uniform composition, the velocity generally increases with depth, despite the fact that the increase of temperature with depth works to lower the wave velocity.

The correct option is B

Answer 3

thank you so much

Answer 4

Your are welcome

Answer 5

do you know this Which is not evidence that Wegener used to support his theory of continental drift?

A.
Similar glacial deposits were found in South America, Antarctica, Africa, and Australia.

B.
Mesosaurus fossils have been found in South America and Africa.

C.
The continental boundaries fit together.

D.
Seismic activities have been associated with continental plates.

Answer 6

How we interpret the science of centuries past cannot be separated from our view of modern science. The danger is that this view may be based on a stereotype. A common stereotype of a scientist is that of a rational professional that evaluates new ideas based only on an objective evaluation of data. This would leave the impression that, unlike early scientists, modern scientists proposing radical new ideas do not need to fear the reactions of those entrenched in the existing system. Alfred Wegener is one modern scientist amongst many that demonstrate that new ideas threaten the establishment, regardless of the century.

Alfred Wegener was the scientist who championed the Continental Drift Theory through the first few decades of the twentieth century. Simply put, his hypothesis proposed that the continents had once been joined, and over time had drifted apart. The jigsaw fit that the continents make with each other can be seen by looking at any world map. The image below shows the continents of Africa and South America joined together.

The correct option is B

Answer 7

thank you :)

Answer 8

Your are welcome

Answer 9

cam i ask you a few more im taking a hard test

Answer 10

Which best describes the difference between a seismograph and seismogram?

A.
A seismograph is the instrument that detects and records volcanic activity, while a seismogram is the written record of that activity.

B.
A seismograph is a written record of volcanic eruptions, while a seismogram is a written record of earthquakes.

C.
A seismograph is the instrument that detects and records movements within the earth, while a seismogram is the recording.

D.
A seismograph records tectonic activity, while a seismogram records volcanic activity.

Answer 11

The difference between a Seismogram and a Seismograph is that a Seismograph is an instrument for recording earthquakes while a Seismogram is a data output from a seismograph. Seismograph detects an earthquake's direction, intensity and time. A Seismogram is depicted through graphs by a seismograph.

Answer 12

thx

Answer 13

A