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What is the crust?
The outermost layer of the earth
What is the asthenosphere?
layer of weak/soft mantle, made of rock that flows slowly, tectonic plates move on top of that layer.
What is the difference between plate tectonics and tectonic plates?
Tectonic plates are the actual pieces of earth crust, and plate tectonics is the idea/theory that explains how they move
what is plate tectonics?
The theory that earths surface is divided into moving plates
What are tectonic plates?
large pieces of earths litosphere that move
what is mantle?
between the crust and the core
What is the mesosphere
lower part of the mantle, rock flows more slowly than rock in atmosphere
What is pangea?
A supercontinent that existed millions of years ago.
Who got the idea of pangea and what those the word mean
Alfred Wegener, pangea means all earth in ancient greek
TRUE OR FLASE:
when Alfred Wegener shared his ideas about Pangea everyone believed him.
FALSE. At first Alfred got rejected because of having no evidence
what is convection?
Is the movement of matter that results from differences in density caused by variations in temperature
what's the inner core and the outer core?
inner core: the very center of the Earth. it is a solid ball made of metal, mostly iron and nickle, its very hot
Outer core: layer around the inner core. Made of iron and nickle but its liquid and moves around
What is sea-floor spreading?
the process of new oceanic crust forming at mid-ocean ridges
what are the three types of boundaries and what do they do and what do they form?
1. CONVERGENT BOUNDARY: plates move TOWARD each other. form mountains
2. DIVERGENT BOUNDARY: plates move APART. forms mid- ocean ridges
3.TRASNFORM BOUNDARY: plates SLIDE past each other horizontally. Cause earthquakes
why cold mantle material sinks?
Cold material is denser and heavier than warm material, so it sinks
what is the core?
The core is the deepest and hottest layer of the earth, it has 2 parts the outer core and inner core. Its the center of the earth.
What are the 3 compositional layers and what are they classified for?
they are classified for its chemical properties
1. CRUST
2.MANTLE
3.CORE
what is the continental drift?
Continental Drift was a scientific hypothesis proposed by Alfred Wegener in 1912, suggesting that Earth's continents were once joined together in a single landmass called Pangaea.
What discoveries support the idea of the continental drift?
Age & Magnetic Properties of the sea floor
Sea-Floor Spreading
Ocean Trenches
what is the litosphere?
outermost layer, includes the crust and the upper mantle divided into tectonic plates
What are the 5 physical layer and what are they classified for?
they are classified for its physical properties
1. LITOSPHERE
2.ASTHENOSPHERE
3.MESOSPHERE
4.OUTER CORE
5.INNER CORE
What is mantle convection (one of the forces that move tectonic plates)
convection currents drag plates: warm material rises, and cool material sinks
What is ridge push? (One of the forces that move tectonic plates)
New warmer, and less dense rock at mid-ocean ridges pushes older rock as it cools.
What is slab pull (one of the forces that move tectonic plates)
A sinking plates weight pulls the rest of the plate down