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WorksheetsFirst Quarter 3rd Summative test in Science 10
Total questions: 30
Worksheet time: 31mins
As a new seafloor is formed at the mid- ocean ridge, the old seafloor farthest from the ridge is destroyed. Which of the processes describe how the oceanic crust plunged into the Earth and destroyed at the mantle?
Convention
Construction
Diversion
Subduction
Who were the two scientists who proposed the theory of seafloor spreading in the early 1960s?
Charles Darwin and James Hutt
Harry Hess and Robert Dietz
John Butler and Arthur Smite
F.Vine and D. Mathew
The older seafloor sinks, the weight of the uplifted ridge pushes the oceanic crust toward the trench at the subduction zone. This process is called _____.
Ridge push
Slab pull
Subdue
Earthquake
Which of the choices is involved in the tectonic plate movement . The weight of the subducting plates pulls the trailing slab into the subduction zone.
Ridge push
Slab pull
Subduction
Earthquake
During the 1960's, scientists were already equipped with gadgets needed to explore the deep ocean. What discovery about the ocean floor is associated with seafloor spreading?
Mountains are denser than the mantle
The magnetic poles of the Earth have migrated.
The crust of the continents is denser than the crust of the ocean.
The crust of the ocean is very young relative to the age of the crust of the continents.
Which of the following increases with distance from a mid-ocean ridge?
The age of oceanic lithosphere
The thickness of the lithosphere
The depth to the sea floor
all of the above
What is the correct sequence of the process of the convection current?
1. Hot, less dense rising material spreads out as it reaches the upper mantle causing forces.
2. The hot magma flows out of the mantle and cools down to form new ocean crust.
3. The forces lift and split the lithosphere at divergent plate boundaries.
4. The downward movement of the convection current occurs along a convergent boundary where the sinking force pulls the tectonic plate downward.
1-2-3-4
1-3-2-4
1-2-4-3
1-3-4-2
What causes the plate to move around in the mantle?
Subduction
Construction
Diversion
Convection
Where does convection current occurs?
Crust
Mantle
Core
Inner Core
It is the name given to the ancient supercontinent composed of earlier forms of today’s continents.
Laurasia
Pangaea
Gondwanaland
Land of Dawn
If you are a cartographer (person who makes maps), what will give you an idea that the continents were once joined together?
Ocean depth
Position of the South Pole
Shape of the continents
size of the Atlantic Ocean
One kind of evidence that supports Wegener’s hypothesis is that
The same magnetic directions exist on different continents
Major rivers on different continents match
Land bridges still exist that connect major continents.
Fossils of the same organisms have been found on different continents.
What was the main reason Wegener’s continental drift hypothesis was rejected?
He was not well-liked by other scientists
He could not provide a mechanism for the movement of the continents
He could provide only illogical explanations for the movement of the continents
His evidence was incorrect
What have scientists found out about how fossils are distributed that points to the theory of plate tectonics?
Fossils of the same animals have been found on different continents
Fossils of animals are always restricted to the same continent
Fossils are always found on plate boundaries
Fossils never cross plate boundaries
Why was the Mesosaurus a significant piece of evidence to Alfred Wegener’s hypothesis?
It was a freshwater reptile found across the ocean; continents must have been together and drifted apart
They found it all over the world; it must have lived in the ocean
The mesosaurus was only found near the equator but was an animal that lived in cold climates
The mesosaurus is a flying reptile that is why its fossils were found on different continents
Glacial scars were found in Africa. What does this evidence indicate?
Africa has always been near the equator
Africa was once in an area of the Earth that had a very cold climate
The continents have not moved
Seafloor spreading
What did scientists in a submersible see when they observed the mid-ocean ridge?
A convergent boundary
Rocks formed by a rapid hardening of molten material
The movement of Earth’s plates
Convection currents in the ocean
Early studies of the ocean floor helped to develop the theory of plate tectonics because
the age of oceanic crust increases with distance from a mid-ocean ridge
oceanic crust is nearly the same age as continental crust
oceanic crust is older near the center of a mid-ocean ridge
oceanic crust is younger near a deep-ocean trench
Seafloor spreading occurs because ________
new material is being added to the asthenosphere
earthquakes break apart the ocean floor
sediments accumulate at the area of spreading
molten material beneath Earth’s crust rises to the surface
What does the theory of continental drift state?
The continents were once joined in a super continent and have moved over time
Continents are stationary and do not move
The Earth is broken into lithospheric plates that move due to convection currents
None of the above
What evidence did Wegener use in his theory?
Continents fit together like puzzle pieces and similar fossils in widely-spread areas
Glacial scars and evidence from ancient climates
Mountain ranges and coal deposits line up across continents
All of the above
What two specific continents fit together most noticeably?
Africa and North America
South America and Europe
South America and Africa
Antarctica and Africa
Which statement does NOT summarize one of the lines of evidence used by Alfred Wegener to support his theory of continental drift?
Glacial deposits indicate a different climatic condition
Similar fossils are found on widely separated continents
Similar geologic formations occur on both sides of the Atlantic Ocean
Bands of rock are older the farther their position from a mid-ocean ridge
During the 1960’s scientists were already equipped with gadgets needed to explore the deep ocean. What discovery about the ocean floor is associated with the seafloor spreading?
Mountains are denser than the mantle
The rotational poles of the Earth have migrated
The crust of the continent is denser than the crust of the ocean
The crust of the ocean is very young relative to the age of the crust of the continents
Why is Earth not growing in spite of seafloor spreading?
because of subduction in the Atlantic Ocean
because of subduction in the Indian Ocean
because of subduction in the Pacific Ocean
because of subduction in the Gulf of Mexico
How did the discovery of magnetic reversals helped to develop the theory of plate tectonics?
It proved that Earth’s magnetic poles change places
It showed that Earth’s magnetic field changes over time
It proved more evidence that plates move away from a mid-ocean ridge
It allowed hot spots to be used to track plate movements
Which of the following diagrams best illustrates the convection occurring in the mantle?
The Theory of Plate Tectonics is a combination of which two theories?
Seafloor Spreading and Continental Drift
Seafloor Spreading and Tidal Theory
Continental Drift and Fossil Theory
Continental Drift and Big Bang Theory
Which statement best compares the theories of seafloor spreading and continental drift?
Seafloor spreading and continental drift are two names for the same theory
Seafloor spreading proposes that the continents move; continental drift proposes the mechanism for how the continents move
Continental drift proposes that the continents move; seafloor spreading proposes the mechanism for how the continents move
Continental drift proposes that the continents move; seafloor spreading proposes that the continents are stationary
Which observation was does Not support in formulating the hypothesis of seafloor spreading?
Depth of the Ocean
Identifying the location of glacial deposits
Magnetization of the oceanic crust
Thickness of seafloor sediments
