Drifting Continents
Came up with the theory of Pangea
Who is John Wegner?
Refers to Earth’s crust and upper mantle
What is the lithosphere?
Rock that has layers of small particles of rocks or the remains of plants and animals
What are sedimentary rocks?
The process of which oceanic crust sinks beneath a deep-ocean trench then back into the mantle at a convergent plate boundary
What is subduction?
Type of boundaries move away, or diverge from each other.
What are divergent boundaries?
The three types of seismic waves
What are Primary waves, Secondary waves, and Surface waves?
A substance that has to cool in order to form an igneous rock
What is lava or magma?
This device helped scientists realize in the 1990's that the mid-ocean ridges extend into all of Earth's oceans
What is a sonar?
The type of boundaries that come together, or converge
What are convergent boundaries?
The slowest type of seismic wave
What are surface waves?
The color of a rocks powder
What is a streak of a rock?
The process of which new crust is continually created along the ocean floor
What is sea-floor spreading?
The type of boundaries which slide past one another
What are transform boundaries?
A person who studies earthquakes
What is a seismologist?
The irregular way a rock breaks apart
What is fracture in a rock?
They are formed when the denser oceanic plate sinks
How do oceanic trenches form?