Ocean Ridge/Scientists
Ortelius (the Dutch map maker), said what about the continents?
They all fit together like a puzzle
What device measures magnetic fields of rocks on the ocean floor?
magnetometer
What is the shape of a convection current?
a circle
A continental plate CONVERGING with a continental plate creates?
Mountains
What is a ridge?
An underwater volcano
As we move further from the ridge, what happens to the age of the rocks?
They get older
What device measures depth of the ocean floor?
sonar
What kind of plates do convection currents move?
Tectonic
What happens when a continental plate CONVERGES with an oceanic plate?
The oceanic plate is denser, so will subduct
What is a rift?
An above ground volcano created when continental plates separate
As we move further from the ridge, what happens to the size of the rocks?
They get bigger
If a compass is pointing south, what type of magnetic field is the Earth in?
Reversed
What type of fluid does Earth's convection currents exist in?
Magma
What happens when an oceanic plate CONVERGES with an oceanic plate?
The denser oceanic plate subducts
What is a trench?
an underwater hole in the ground caused by a subducting plate
Is oceanic crust younger or older than continental crust?
Younger
Name a commonly used rock that is used to determine magnetic fields on the ocean floor
magnetite
When molecules of something move closer together, what happens to its density?
It gets more dense
What happens when a continental plate DIVERGES with a continental plate?
A rift is created (volcano)
What boundary causes earthquakes?
Transform boundaries
What type of boundary creates an ocean ridge? Name the type of boundary, and the type of plates involved
Diverging oceanic plates
The study of Earth's past magnetic field record is called...
Paleomagnetism
What two states of matter do convection currents occur in?
Liquids and gasses
What happens when a oceanic plate DIVERGES with an oceanic plate?
An oceanic ridge is created (underwater volcano)
What does an underwater earthquake cause?
Tsunami