Types of Rocks
Layers of deposited sediments build up over time
How do sedimentary rocks form?
Fossils that help you find the age of other rocks
What are index fossils?
Hydrogen, nitrogen, oxygen.
What are the building blocks of life?
The oldest layers are at the bottom, and the newer ones are at the top.
what are the positions of rock layers?
What are atoms?
when lava or magma hardens
How is an igneous rock made?
The number of years since the rock has formed
What is absolute Age?
Footprints, trials, and burrows
what are some trace fossil examples?
Gaps in the geological record
How relative age is determined
when particles release energy
Lava that hardens on the surface
What is extrusion?
Comparing the age of a rock to the rocks around it
What is relative age ?
Magma that cools inside the bodies of rocks
What is intrusion?
Used by scientist to determine the relative ages of sedimentary rock layers
TRUE OR FALSE
Radioactive dating is good for igneous rocks but not sedimentary rocks.
True
The time it takes for half of the radioactive atoms to decay
what is half-life?
Trilobites
What is an example of index fossils
A break in earths crust
What is a fault?
The surface where new rock layers meet the older rock
What is unconformity?
A process where elements break down to form another element
Whats radioactive decay?