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WorksheetsEarth's Moving Crust
Total questions: 15
Worksheet time: 8mins
Scientists used the pattern of alternating normal and reversed polarity in rocks to create the geomagnetic
time scale
sea-floor time scale
reversal time scale
What is the crack in the ocean floor through which magma rises?
A ridge
A rip
A rift
Wegener's hypothesis of continental drift was finally confirmed by
fossils from the same reptile found on two continents
evidence supporting the idea of sea-floor spreading
continental coastlines that fit together
Tectonics plates can include
both oceanic and continental crust
only continental crust
only asthenosphere
The Pacific Ring of Fire is
a mid-ocean ridge
a chain of volcanic islands
a zone of active volcanoes
According to Wegener, what happened about 250 million years ago?
The South America and Nazca plate collided
The supercontinent began breaking into smaller continents
Magma rose to Earth's surface and solidified
Frequent Earthquakes in an area may indicate
tectonic plate boundaries
sea-floor spreading
mantle convection
Convection currents, ridges being pushed apart and plates being pulled work together to produce
continental lithosphere
constant tectonic plate motion
earthquakes
Panthalassa was
the supercontinent that formed before Pangaea
one of the continents that formed from Pangaea
the large ocean that surrounded Pangaea
The most conclusive proof for continental drift was provided by
the coastlines of continents on a map
evidence of sea-floor spreading
identical fossils found on two separate continents
At the center of a mid-ocean ridge is a(n)
subduction zone
fracture zone
rift valley
Where do deep-ocean trenches form?
in island arcs
at convergent boundaries
in fracture zones
The asthenosphere is
in the lithosphere
in the core
in the mantle
What happens when two oceanic plates collide?
The denser plate subducts
The less dense plate fractures
The denser plate fractures
What is subduction?
one plate collides with another
one plate destroys another
one plate goes beneath another
