plate tectonics
When was Earth formed?
4.6 billion years ago
What is the 3 types of heat transfer?
Radiation, Conduction, Convection
What is the process of sea-floor spreading?
In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them.
Why was Alfred Wegener's hypothesis of continental drift not taken seriously by most geologists?
because he could not explain how the continents were moving through solid ocean crust, and what force was pushing the continents
What is the outer core made of?
iron and 10% sulfur
How long ago was the earth formed?
4.6 billion years ago
The sun directly heats the air in our atmosphere.
False
What happens at ocean trenches?
In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
What three pieces of evidence led to the continental drift theory?
Rock formation, fossil evidence, and climate evidence
What is the landmass believed to have been all the continents combined called?
Pangea
What can p waves and s waves travel through?
solids
Why is concrete hot?
seafloor spreading begins at the ____?
Rift
Who created the hypothesis of Pangea?
Alfred Wegener
When plates diverge what does it form?
Rift Valley
What plate boundary forms mountains?
convergent
I was sitting next to the fireplace to get warm; this is a form of what heat transfer?
Radiation
molten ______ beneath the surface rises and erupts
Magma
Why was rock formation evidence significant towards continental drift?
because similar rocks were found on opposite sides of the Atlantic Ocean
What is the longest chain of underwater mountains in the world?
Mid-ocean ridge
S waves cannot travel through _____?
liquids
The ______ the molecule is, the faster they move. They begin to move more rapidly and then spread out. The more motion an atom or molecule is, the ______ they are.
hotter
Earth's core heats up the mantle and causes _____ currents.
convection
Why was fossil evidence significant towards continental drift?
because fossils of land animals were found on opposite sides of the ocean
How many major plate tectonics are there?
seven