WorksheetsSci 10 Q1 Evidences of Plate Movements
Total questions: 17
Worksheet time: 11mins
The idea proposed by Alfred Wegener to explain the continental shapes and
positions is known as _____.
Pangea
Continental Drift
Plate Tectonics
Seafloor Spreading
Examine the figure on the right, which two are the best examples of different continental positions in the past?
North America – South America
North America – Africa
South America – Asia
South America – Africa
In the Mid-1900s, scientists mapped mid-ocean ridges using what?
Satellites
Moons
Stars
SONARs
Early observers thought continents might have been joined based on what
observation?
Rocks and Fossils
Earthquakes
Magnetism
Coastline
Wegener suggested that coal beds discovered in Antarctica indicated that this
continent was
once underwater
once near the equator
always frozen
part of Africa
In the figure above, what is the age of the seafloor off of the Bahamas?
younger than 9.6 million years
9.6 – 33.0 million years
33.0 – 83.0 million years
83.0 – 141.9 million year
In the figure above, what is the approximate age of the seafloor off the north
coast of Spain?
younger than 9.6 million years
9.6 – 33.0 million years
33.0 – 83.0 million years
83.0 – 141.9 million years
Peer scientists reviewing Wegener's hypothesis of continental drift rejected his
notion because____________.
his evidence was too few to make a valid conclusion.
he did not explain how continents move and what moves them.
his evidence was not clear in showing how continents were joined.
he lied by including false evidence.
___________ help explain why Earth is not getting any larger even though the
tectonic plates are always moving.
Earthquakes
Fossils
Subduction zones
Volcanoes
If there are MORE mid-ocean ridges than subduction zones, what happens to
the ocean?
It gets larger.
It sinks.
It gets smaller.
Nothing will change.
What do ancient glacier scars found in rock surfaces in Africa tells about its climate in the past?
The continents have not moved.
Africa has always been near the equator.
Africa was once in an area of the Earth that had a very cold climate.
Africa was once covered with ice sheets but did not move ever since.
Which of the following increases with distance from the mid-oceanic ridge?
The age of oceanic lithosphere.
The density of oceanic lithosphere.
The thickness of the lithosphere.
All (A, B, & C)
The Seafloor Spreading Theory states that ________________.
all continents are drifting.
ages of rocks near a ridge are older than the ones far from it.
fossils of plants and animals are found in almost all continents.
hot and less dense material from below the Earth's crust rises towards the
surface at the mid-oceanic ridge.
What can you say about the rate of movement of materials coming out from
the mid-oceanic ridge and the materials sinking in the subduction zone?
The rising of the materials from the ridge is slower than in the subduction
zone.
The movement of the materials in both ridge and subduction zone is the
same.
The rising of the materials from the ridge is faster than in the subduction
zone.
There is no much movement of materials happening in both the ridge and
subduction zone.
What strong evidence discovered by our scientist that Earth's magnetic
reversal had been happening in the past?
The magnetic reversal occurrence is supported by magnetic patterns in
magnetic rocks found on the ocean floor.
The ages of the rocks on the ocean floor are constantly changing.
The magnetic field of the Earth becomes weaker.
The Earth's magnetic field is fluctuating.
Describe the thickness of sediments near and far from the mid-oceanic ridge:
The sediments are thinner near the ridge but thicker as you go far from it.
The sediments are thicker near the ridge but thinner as you go far from it.
The thickness of the oceanic sediments near and far from the ridge is the same.
The sediments are unevenly distributed.
Why is the theory of Continental Drift and Seafloor spreading important?
