Science worksheets for class 4
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What is the Theory of Continental Drift?
New continents are continually being created
and destroyed.
The layout of the continents is the same today
as it has always been
The continents have always been separate but
may one day drift together to form a single
continent
All the continents were once one continent that
broke up and drifted apart over hundreds of
millions of years
The cause of earthquakes and how they are formed is the
Greenhouse Effect in the Ozone
melting of glacial ice in global warming
movement of continental plates
meteors that hit earth's surface from space
The theory of continental drift states that all the continents were once part of one big landmass called Pangaea. Who was the scientist that came up with this theory?
Harry Hess
Bill Nye
Alfred Wegener
Albert Einstein
Why was Alfred Wegener unable to explain his theory?
He couldn't explain how the continents drifted.
He couldn't explain why similar fossils on different continents were separated
He couldn't explain why similar geological structures found were found on different continents.
He couldn't explain why the continents fit together like a puzzle.
Tectonic plates float on top of the
crust
asthenosphere
lower mantle
outer core
This theory states that hot, dense material (magma) below Earth’s crust rises to the surface and flows sideways, carrying dirt and other materials away from the ridge in both directions.
erosion
subduction
seafloor spreading
continental drift
These are large sections of Earth’s oceanic or continental crust and rigid upper mantle that move around on the asthenosphere.
Pangaea
continental drift
seafloor spreading
plates
Is there a pattern to the locations of earthquakes and volcanoes around the globe?
No, earthquakes and volcanoes are random.
Yes, earthquakes and volcanoes usually occur near the boundaries of tectonic plates.
yes, earthquakes and volcanoes usually occur in the middle of tectonic plates.
No, earthquakes and volcanoes usually occur under water.
What type of evidence was NOT used by Alfred Wegener to support his continental drift hypothesis?
evidence from rock formations
evidence from fossils
evidence from human remains
evidence from glaciers
Earth's lithospheric plates move at a rate of a few _____________ every year.
centimeters
miles
kilometers
yards
A tectonic plate is ____.
what cavemen ate dinner on
the Earth
pieces of Earth's crust
an underground mountain
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