Theories /Rules/Laws
what is law of superposition?
when magma comes up and breaks through surface of rock
What is extrusion?
Current time period
What is Cenozoic?
Sudden violent shaking due to Earth's movement
A place where plate boundaries move towards each other
What is convergent boundary?
Earth's crust is divided into plates which move across the mantle
What is theory of plate tectonics?
When magma doesn't break through the rocks surface
What is intrusion?
When dinosaurs and early birds lived
Mountain or hill where magma flows through a vent
What is volcano?
What is the mantle?
Earth's continents move across the surface
Theory of Continental drift
Oldest fossil layer
What is the bottom?
Bacteria
What is precambrian?
Dense, destructive mass of hot ash, gases and lava flowing down hill
Supercontinent that existed previously
What is pangea?
fossils that are used to identify geological time periods.
*Requirements:
They must be widespread (exist in many different rock strata samples)
They must exist in only ONE time period (only ONE rock strata)
What is index fossil?
Rock formed through heat and pressure
What is metamorphic?
Primitive insects and plants
What is paleozoic?
Areas closer to the epicenter experience _
What is more damage and greater intensity?
occurs near or at plate boundaries
What are earthquakes and volcanic eruptions?
to find out the relative order of past events and NOT the exact date of the past events
What is relative dating?
What is igneous rock?
Trilobites
Seismic wave that moves through crust and does the most damage
What is surface waves or L waves?
Natural event that causes great loss of life and damage
What is a natural disaster?