Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
model
|
is something used to represent an object or an idea
|
|
|
crust
|
Earth's outer layer. it is the thinnest of all the layers, but it varies in thickiness around Earth
6miles thin to 40miles thick |
|
|
core
|
consists of heavy material that sank to Earth's center billions of years ago
|
|
|
relative age
|
is how old it is compared to other rocks
|
|
|
index fossils
|
to help them tell the relative ages of rock
|
|
|
absolute age
|
how old the rock really is
|
|
|
fold
|
a bend in a rock layer
|
|
|
anticline
|
is an upward fold of rock layers
|
|
|
syncline
|
is a downward fold of rock layers
|
|
|
erosion
|
wind moving water ice and gravity all erode rocks
|
|
|
fault
|
a break in rock along which movement has occurred
formed the Gran Canyon |
|
|
What is the earth's crust made up of?
|
solide rock mostly granite, gabbro, adn basalt but it also includes all the igneous, sedimentary and metamorphic rocks
|
|
|
What is the curst covered by?
|
oceans lakes, rivers sediments plants and soil
|
|
|
How is the crust broken?
|
into large and small pieces called plates which float like rafts on thelayer below the crust. They move very slowly aroung Earth's surface carry the contents and oceans with them
|
|
|
mandle
|
is below the crust it is the thickest layer and it takes up about 84% of Earth's volume. It is the closest to the crust and it is made of solid rock
|
