What force is responsible for moving the continents?
Heat and gravity are fundamental to the process The energy source for plate tectonics is Earth’s internal heat while the forces moving the plates are the “ridge push” and “slab pull” gravity forces. It was once thought that mantle convection could drive plate motions.
What have caused the continents to move?
The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth’s mantle below the crust. Earthquakes and volcanoes are the short-term results of this tectonic movement. The long-term result of plate tectonics is the movement of entire continents over millions of years (Fig.
What is the primary force in the theory of ocean sea floor spreading?
Plate tectonics
| Question | Answer |
|---|---|
| The primary force that causes the seafloor to spread and continents to drift | Thermal convection |
| Plate | Tectonics |
| The zone below the list of fear is more plastic then the lithosphere so it is easier to bend | Asthenosphere |
| Zones place where the seafloor is forced under continental plates | Subduction |
Is sea floor spreading a fast or slow process?
It spreads about 6-16 centimeters (3-6 inches) every year. There is not an ocean trench at the East Pacific Rise, because the seafloor spreading is too rapid for one to develop!
What are 3 pieces of evidence to support that seafloor spreading is happening?
Look at Figure 19 to see the process of sea-floor spreading. Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material, magnetic stripes, and drilling samples.
Which of the following is not evidence of seafloor spreading?
Your answer: The distribution of ice sheets across the planet is not an evidence of sea-floor spreading.
What is the first step to seafloor spreading?
1. A long crack in the oceanic crust forms at a mid ocean ridge. 2. Molten material rises and erupts along the ridge.
What boundaries can destroy seafloor?
Convergent margins This is accomplished at convergent plate boundaries, also known as destructive plate boundaries, where one plate descends at an angle—that is, is subducted—beneath the other.
What are examples of transform boundaries?
The most famous example of a transform boundary is the San Andreas Fault in California. The west side of California is moving north, and the east side is moving south.
How is seafloor destroyed?
Framework Integration: Themes: Patterns of change: over time, new sea-floor is created by the upwelling of magma at mid-ocean spreading centers; old ocean floor is destroyed by subduction at deep sea trenches. Life Science: animals found at hot-water vents on the ocean floor.
What are some examples of divergent boundaries?
Examples
- Mid-Atlantic Ridge.
- Red Sea Rift.
- Baikal Rift Zone.
- East African Rift.
- East Pacific Rise.
- Gakkel Ridge.
- Galapagos Rise.
- Explorer Ridge.
Which of the following is the best example of divergent boundaries?
Perhaps the best known of the divergent boundaries is the Mid-Atlantic Ridge. This submerged mountain range, which extends from the Arctic Ocean to beyond the southern tip of Africa, is but one segment of the global mid-ocean ridge system that encircles the Earth.
What are the non examples of divergent boundaries?
Non-examples of Divergent Boundaries
- Ocean.
- Earthquake.
- Landforms.
- Tsunami.
- Fault.
What are the 2 types of divergent boundaries?
There are two types of divergent boundaries, categorized by where they occur: continental rift zones and mid-ocean ridges.