rocks. I love rocks. (lies) Flashcards
1
Q
how old is the earth
A
4.54 billion years old
2
Q
how do we know how old the earth is
A
dating rocks on the earths crust and uncovering fossils
3
Q
how can we date rocks
A
commonly use radiometric dating methods by determining the natural radioactive content
4
Q
first part of the rock cycle
A
magma cools and turns into igneous rock
5
Q
second part the rock cycle
A
igneous rock is weathered into sediments
6
Q
third part of the rock cycle
A
sediments are compacted into SEDImentary rock
7
Q
fourth part of the rock cycle
A
sedimentary rock is pressurized into metamorphic rock
8
Q
fifth and final part of the rock cycle
A
metamorphic rock is melted back into magma
9
Q
what can happen at any stage in the rock process
A
the rocks can melt back into magma
