Question and answer
how do scientists now about earths interior?
Knowledge of the Earth's interior is based on the reactions of seismic waves from earthquakes to the density and state of materials that they encounter. [ Seismic waves travel at differing speeds through different materials (and also, at different speeds through material of different states, i.e., liquid or solid). Because we know the size of the Earth, by measuring how long it takes to pick up on seismic activity on opposite sides of the Earth, we can gauge about how much of the Earth is solid, liquid, made of a certain material, etc. Some of it, also, is based on our current
understanding of how the Earth formed - mainly, that as our planet formed and cooled, the heavier materials such as metal sunk to the center. Rock that is torn off and expelled by volcanism is studied as another indicator of what lies below the surface. Another clue lies in meteorites that have landed on Earth known as Chondrites. These can indicate the material from which planets are formed. The study of Earth's magnetic field and gravitational properties also indicate or strongly infer what lies deep in Earth's interior. Knowledge of the shallower (but otherwise difficult to access) oceanic crust and mantle has been gained due to a process known as obduction where oceanic crust is forced over continental crust. These rocks are known as Ophiolites and give Geologists direct access to the rocks in question. Read more: ]
Expert answered|selymi|Points 8942|
Question
Asked 9/30/2012 11:37:03 AM
0 Answers/Comments
This answer has been confirmed as correct and helpful.
s
Get an answer
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
31,992,739
questions answered
GET
Answers.
GET THE APP.
weegy*
*
Get answers from Weegy and a team of really smart live experts.
Popular Conversations
S
L
Points 634 [Total 3631] Ratings 2 Comments 614 Invitations 0 Offline
S
L
P
L
P
Points 537 [Total 6560] Ratings 1 Comments 527 Invitations 0 Offline
S
L
P
R
P
R
L
P
P
C
R
P
R
L
P
R
Points 450 [Total 12541] Ratings 1 Comments 310 Invitations 13 Online
S
L
P
1
Points 387 [Total 3243] Ratings 2 Comments 367 Invitations 0 Offline
S
L
Points 335 [Total 1828] Ratings 1 Comments 325 Invitations 0 Offline
S
L
Points 214 [Total 214] Ratings 2 Comments 194 Invitations 0 Offline
S
L
Points 212 [Total 4596] Ratings 1 Comments 202 Invitations 0 Offline
S
L
1
Points 145 [Total 3456] Ratings 2 Comments 125 Invitations 0 Offline
S
L
Points 111 [Total 262] Ratings 2 Comments 91 Invitations 0 Offline
S
L
Points 71 [Total 230] Ratings 0 Comments 71 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.