Question 1

Rates of plate motion are best determined by

Accepted Answer

Dating magnetic anomalies on the seafloor and calculating distance from the spreading center is the most accurate method for determining rates of plate motion.

Question 2

The first rock type similarities between Gondwana continents to be discovered were

Accepted Answer

The first rock type similarities between Gondwana continents to be discovered were glacial tillites, which are deposits left by glaciers, indicating that these continents were once connected and located near the South Pole.

Question 3

Beside his hypothesis of continental drift, Frank Taylor (1910) correctly proposed that

Accepted Answer

The Mid-Atlantic Ridge is the zone along which the continents had separated.

Question 4

If the continents were once joined together, rocks and mountain ranges on the margins of each

Accepted Answer

The theory of continental drift, which posits that continents were once joined together in a single landmass and have since drifted apart, implies that rocks and mountain ranges on the margins of each continent would have formed under the same conditions, in the same sequences, at the same time, and with the same structural trends and forces, as they were part of the same geological processes before the continents separated.

Question 5

Studies of paleomagnetism showed that

Accepted Answer

Paleomagnetism studies revealed that the ocean basins are relatively young due to the patterns of magnetic stripes on the ocean floor, which indicate seafloor spreading and the creation of new oceanic crust.

Question 6

That the oceanic crust is geologically young and the parallel magnetic striping pattern of basalts is symmetrical about oceanic ridges was conclusively shown by

Accepted Answer

The answer of That the oceanic crust is geologically young...

Question 7

In plate tectonic theory, the lithosphere

Accepted Answer

The answer of In plate tectonic theory, the lithosphere
...

Question 8

The forces operating at continent-continent convergent plate boundaries are

Accepted Answer

At continent-continent convergent plate boundaries, the forces are compressional due to the plates moving towards each other and colliding, leading to the formation of mountain ranges and other geological features through the process of orogeny.

Question 9

A transform plate boundary may connect

Accepted Answer

Transform plate boundaries can connect various types of plate boundaries, including spreading ridges (where plates move apart) and subduction zones (where one plate moves under another). They can also connect two spreading ridges or two subduction zones, allowing for lateral movement of the Earth's crust along faults.

Question 10

The age and distribution of the Hawaiian Islands - Emperor Seamount chain show that the absolute motion of the Pacific Plate from the past to the present was

Accepted Answer

The age and distribution of the Hawaiian Islands - Emperor Seamount chain indicate a change in the direction of the Pacific Plate's movement. Initially, the movement was north-northwesterly, as shown by the Emperor Seamounts' direction. Later, as the chain transitions into the Hawaiian Islands, the direction shifts to west-northwesterly, reflecting a change in the Pacific Plate's motion over time.

Question 11

An acceptable hypothesis concerning the driving mechanism of plate tectonics must explain

Accepted Answer

An acceptable hypothesis for the driving mechanism of plate tectonics must account for past, present, and future plate configurations and movements. This includes understanding historical plate arrangements and movements, current plate dynamics, and predictions for future movements based on current understanding.

Question 12

The currently accepted hypothesis for the driving mechanism of plate tectonics is based on

Accepted Answer

The currently accepted hypothesis for the driving mechanism of plate tectonics is thermal convection cells in the asthenosphere and mantle. This process involves the movement of heat from the Earth's interior to its surface, driving the movement of tectonic plates.

Question 13

___________ ___________ first suggested in 1885 that South America, Africa, India, Australia, and Antarctica had once been a single landmass, and he gave the nameto this proposed supercontinent.

Accepted Answer

The answer of ___________ ___________ first suggested in 1885 that...

Question 14

___________flora was the name given to the group of plant fossils which was considered as evidence for the supercontinent Gondwana.

Accepted Answer

The answer of ___________flora was the name given to the...

Question 15

The scientist who is credited with first seriously proposing continental drift earlier this century was___________ ___________ .

Accepted Answer

The answer of The scientist who is credited with first...

Question 16

___________is the name Wegener proposed for the supercontinent that was comprised of all of the continents.

Accepted Answer

The answer of ___________is the name Wegener proposed for the...

Question 17

A___________ plate boundary is a collisional boundary between two plates, in most cases where plate subduction is occurring.

Accepted Answer

The answer of A___________ plate boundary is a collisional boundary...

Question 18

The maximum age for oceanic crust is___________ million years.

Accepted Answer

The answer of The maximum age for oceanic crust is___________...

Question 19

Pangaea began to fragment in the___________ Period.

Accepted Answer

The answer of Pangaea began to fragment in the___________ Period....

Question 20

___________within the___________ is believed to be the mechanism for plate movement.

Accepted Answer

The answer of ___________within the___________ is believed to be the...

Quiz 2: Plate Tectonics: A Unifying Theory