What are 3 types of evidence for seafloor spreading?
The pieces of evidence gathered for sea-floor spreading include the evidence from molten material, magnetic stripes, and drilling samples.
What is one piece of evidence of seafloor spreading?
One piece of evidence of seafloor spreading is a mid-ocean ridge. Explanation: The Mid-Atlantic Ridge is a mountain system formed by plate tectonics on the seafloor.
What are the 4 evidences for seafloor spreading?
Harry Hess's hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.
What are the main features of the seafloor?
There are nine main features of the ocean floor which include (1) continental shelf, (2) continental slope, (3) continental rise, (4) abyssal plains, (5) abyssal hill, (6) mid-ocean ridges, (7) seamounts, (8) deep ocean trenches, and (9) volcanic islands.
How does seafloor spreading provide evidence of past plate motion?
At first the driving force for spreading was argued to be convection currents in the mantle. Since then, it has been shown that the motion of the continents is linked to seafloor spreading by the theory of plate tectonics, which is driven by convection that includes the crust itself as well.
Which is one piece of evidence of seafloor spreading Quizizz?
What is one piece of evidence of seafloor spreading? The age of the oceanic crust gets older the further you go from a mid-ocean ridge.
Which is one piece of evidence of seafloor spreading quizlet?
What is the evidence for sea-floor spreading? Several types of evidence supported Hess's theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
What is the evidence for seafloor spreading quizlet?
What three types of evidence provided support for the theory of sea floor spreading? eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
Where does seafloor spreading occur?
Seafloor spreading or ocean-floor spreading happens at the midocean ridges.
How do scientists observe the ocean floor?
Scientists use cameras and sonar near the U.S. Virgin Islands to 'see' the sea floor and find out how fish and other sea life use the underwater habitats, which include coral reefs and sea grasses.
Which of the following best describes seafloor spreading?
New oceanic crust is formed at mid ocean ridges, pushed away from the ridge, and destroyed at deep-sea trenches is the correct statement (Option B) Explanation: Seafloor spreading is a process that occurs at the mid ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away …
What is seafloor spreading Quizizz?
What is Sea-Floor Spreading? Mid-Ocean ridges continually add new material to the ocean floor. Mid-Ocean trenches continually add new material to the ocean floor.
What is the major evidence that sea floor spreading creates new lithosphere explain your answer?
The record of magnetic reversals is carried away from each side of the spreading center of a mid-ocean ridge showing that the molten rock is creating new lithosphere.
What causes seafloor spreading quizlet?
The older rock moves outward on both sides of the ridge as new rock forms in the center of the ridge from cooling of molten material. This process is sea floor spreading.
How is pillow lava evidence of seafloor spreading?
Seafloor Spreading Because the lava erupts into water, it cools rapidly and forms rounded structures called pillow lavas. As the seafloor continues to spread apart, the older oceanic crust moves away from the mid-ocean ridge.
How do scientist were able to detect the features on the ocean seafloor?
Using Sonar The same principle explains how sonar works. A ship on the surface sends sound waves down to the ocean floor. The sound waves bounce off the ocean floor and return to the surface, like an echo.
What are 3 ways to study the sea floor?
Today's technology lets scientists to study the ocean in a quicker and precise way. There are three tools used to map the ocean floor, sonar, satellites, and submersibles. Sonar is a type of electronic depth-sounding equiptment made in the 1920's.It is an acronym for sound navigation and ranging.
Where does seafloor spreading happen?
Seafloor spreading or Seafloor spread is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
What is seafloor spreading quizlet?
sea-floor spreading. the process by which molten material adds new oceanic crust to the ocean floor.
How do scientists know the seafloor is spreading quizlet?
By drilling and taken age of rock scientist have found that the farther away the rock is from the ridge the rock is older. This show the process of see floor spreading.
What type of rocks form pillows on the sea-floor?
Basalt "pillows" form when lava cools quickly under water. The lack of bubbles in the lava suggests that the rock crystallized on the ocean floor under the pressure of deep water (preventing bubbles from forming in the lava).
How do I know if my pillow is lava?
Pillow lavas are bulbous, spherical, or tubular lobes of lava.
How is the seafloor studied?
Sub-bottom profiling systems are used to identify and characterize layers of sediment or rock under the seafloor. The layers of the seafloor are examined with seismic reflection and seismic refraction (also called wide angle seismics). Echosounding is a basic type of seismic reflection.
How does seafloor spreading prove continental drift?
The Mechanism for Continental Drift Seafloor spreading is the mechanism that Wegener was looking for! Convection currents within the mantle drive the continents. The continents are pushed by oceanic crust, like they are on a conveyor belt. Over millions of years the continents move around the planet's surface.
What scientist helped discover the process of seafloor spreading quizlet?
Harry Hess was the scientist who helped discover sea floor spreading.
Is pillow lava underwater?
The formation of pillow lava in the deep ocean has never been observed, but it probably looks a lot like this. This movie shows pillow lava flowing underwater off the coast of Hawaii, after it was erupted on land and flowed into the ocean.
What is volcanic flooding?
Flood Basalts are high volume eruptions that flood vast areas of the Earth, covering broad regions with flat lying lava surfaces. They are said to be the result of mantle convection through hot spots, which occur sporadically in time and place.
Which of the following volcanic areas is not part of the Ring of fire?
Which of the following volcanic areas is NOT part of the Ring of Fire? Iceland is part of an oceanic hot-spot volcanic area straddling the Mid-Atlantic Ridge; the others all ring the Pacific Ocean.
What are the evidence of the continental drift?
The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.
What is the 4 evidence of continental drift?
The four pieces of evidence for the continental drift include continents fitting together like a puzzle, scattering ancient fossils, rocks, mountain ranges, and the old climatic zones' locations.