Continental Drift
Continental Drift is a blank process?
Slow
Matter has many different?
properties
Lava is made when?
Magma reaches the earth's surface
Solid
How many plates are there?
16
All the continents were once together and called?
Pangaea
All matter is?
constantly moving
What do some materials conduct well with?
Mass and weight depend on the what of the object?
size
Fossils of a plant called what has been found on every continent?
Glossopteris (glahs-AHP-tur-us)
The evidence for drifting continents was hidden on the?
Seafloor
Materials have a melting point and and what point?
boiling
Substances like wood and paper are?
flammable
Volume
The amount of space a substance takes up.
When did scientists began exploring the seafloor?
In the late 1940s.
One clue Wegener used to support continental drift came from?
Glaciers
Some changes in matter, change the identity of a what?
Substance
A chemical equation is a useful way to express what happens during a what?
chemical reaction
Does the density of a substance ever change?
No
Ocean Trenches
Deep under water troughs on the seafloor.
Continental Drift
Hypothesis suggested that continents are in constant motion on the surface of Earth.
What do many substances react with?
Acid
Wegener supported his idea till his death in 1930. How many years was it until his ideas were accepted?
40 years
Density
The mass of a substance divided by the volume of the substance.
When the seafloor spreads, the rock below the seafloor becomes?
Molten