Show:
Igneous
Metamorphic
Sedimentary
Geologic Time
Potpourri
100
Igneous rocks are formed when ___________ cools and then _______________?
When MAGMA cools and the HARDENS
100
What does "metamorphism" mean?
to change shapes
100
What is sediment?
particles of rock, sand, soil, and plant and animal remains
100
How old do scientists believe that the earth is?
over 4 billion years old
100
Rock models show the oldest rocks on the (top/bottom)?
bottom
200
Name the two types of igneous rocks?
Intrusive and Extrusive
200
Where do rocks change?
deep in the earth
200
what causes sedimentary rocks to form?
when sediment compacts in layers without heat or pressure
200
The earth's changes over time are recorded where?
in the earth's crust
200
Whcih type of scientist studies fossils to see what earth was like millions of years ago?
Paleontologists
300
The texture of an igneous rock depends on how long this takes?
how long the magma takes to cool and harden
300
What causes minerals in rocks to chemically react with each other to form new minerals?
Heat and pressure
300
What are the preserved remains of plants and animals called?
Fossils
300
Which scientists study the earth's history?
geologists
300
What are fossils?
The remains of plants and animals preserved in rocks or the earth's crust.
400
What type of rock is formed when magma cools slowly below the earth's surface?
Intrusive
400
What type of rock has bands the line up in flat layers?
foliated metamorphic rock
400
Why are sedimentary rocks layered?
Because wind and water deposit sediment in layers which is eventually cemented together
400
What is geologic time?
time that has passed since geologists believe the earth was formed
400
What do you call a fossil that is found in the same rock layer all over the world?
Index fossil
500
What type of rock is formed when magma cools quickly on the earth's surface?
Extrusive
500
Metamorphic rocks change fromt he heat of magma and the pressure of _____________ ______________?
mountain ranges
500
What type of sedimentary rock froms from the remains of plants and animals?
Organic sedimentary rock
500
Geologists study the layers of ___________ and ______________ to determine the earth's history?
Layers of rock and fossils
500
What do scientiests use index fossils to determine?
the ages of rocks