Flashcards in Earth Scie Deck (85)
Modified Mercalli's Scale
Effects and Damages
total energy released at its focus
Origin of earthquake
above the focus
shape of the Earth
Oblate spheroid (flattened at the poled, bulging at the sides)
Any movement of the Earth's Crust
Layers of the Earth
Variety of igneous, metamorphic, sedimentary rocks
occupies less than 1% of Earth's volume.
The upper part of the mantle is composed mostly of
peridotite, a rock denser than rocks common in the overlying crust.
The boundary between the crust and mantle
makes up a whopping 84% of Earth’s total volume.
silicates of iron and magnesium, sulphides and oxides of silicon and magnesium.
Molten material that surrounds the core
Solid outerpart of the Earth
included brittle upper mantle and the crust
most rigid (elastic but not viscous)
Coolest of the Earth's layer
Much hotter and fluid than lithosphere
magma like liquid layer that surrounds the Inner Core and creates Earth's magnetic field.
iron and some nickel
believed to be just as hot as the sun's surface.
made up of an iron-nickel (metal) alloy.
Solid because of high pressures
siderophiles (gold, cobalt, platinum)
Continental Drift Theory
Theory of Sea-floor spreading
occurs at mid-ocean ridges where new oceanic crust if formed through volcanic activity
support continental drift
Plate Tectonic Theory
Lithosphere is divided into tectonic plates
three types of plate boundaries
formed by collision of two continental plates
deepest part of the ocean formed by collision of continental and oceanic plate
chain of mountains in the middle of the ocean
formed by spreading of the ocean floor
crack on Earth's Crust when plates slip past each other
collision of continental and Oceanic plate
molten rock, gases, pyroplastic debris erupt through the crust
molten rocks beneath the crust
molten rocks at the surface of the crust