Vocab
8.1
8.1
Mid-ocean ridge
A long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.
Divergent Boundary
A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates. The middle of the Red Sea and the mid-ocean ridge (running the length of the Atlantic Ocean) are divergent plate boundaries. Also called passive margin spreading zone See more at tectonic boundary. Compare convergent plate boundary.
What is the best guess for hypothesis?
A. Random guess
B. Estimate
C. Scientific guess
D. Suppose
C.
What kind of plate boundary occurs where two plates grind past each other without destroying or producing new lithosphere?
Transporstion
If a plate moves 2 cm in 1,000,000 years. What is the answer?
.2 cm
Sea-floor Spreading
The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
convergent plate boundary
A tectonic boundary where two plates are moving toward each other. If the two plates are of equal density, they usually push up against each other, forming a mountain chain. If they are of unequal density, one plate usually sinks beneath the other in a subduction zone. The western coast of South America and the Himalayan Mountains are convergent plate boundaries. Also called active margin collision zone See more at tectonic boundary. Compare divergent plate boundary.
What might you infer about South America and Africa being movable objects?
They would've been stuck together.
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth's mantle to the surface, solidifying to create new oceanic crust.
A plate moves 1 cm per years. How many years till it moves 1 meter?
100 years
Subduction
The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate. "subduction zone"
Transform Boundary
The transform plate boundary is a broad zone forming as the Pacific Plate slides northwestward past the North American Plate. It includes many lesser faults in addition to the San Andreas Fault.
How many tectonic plates are there?
The World Atlas names seven major plates: African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American. California is located at the seam of the Pacific Plate, which is the world's largest plate at 39,768,522 square miles, and the Northern American plate.
What are the moving plates of the Earth's crust called?
Tectonic Plates
In 50 years a plate moved 1 meter. How many cm per year?
2 cm per year.
Ocean Trench
Ocean trenches are long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth.
Transform Boundary
The transform plate boundary is a broad zone forming as the Pacific Plate slides northwestward past the North American Plate. It includes many lesser faults in addition to the San Andreas Fault.
What happens to the continental crust when two continents collide?
When two plates carrying continents collide, the continental crust buckles and rocks pile up, creating towering mountain ranges.
Is the continental crust heavier than the oceanic crust?
Yes
In 1,000 years a plate moved 500 cm. How many cm per year?
.5 cm
Hypothesis
A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Give me an example of a theory.
Good!
How does mantle convection cause seafloor spreading?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.
How many years from Pengea?
200,000,000