unit 3

Theory proposed by Alfred Wegener that said all continents were once joined 300 million years ago in a single landmass called Pangaea.

Subduction is when one lithospheric plate descends beneath another

Locations of earthquakes and volcanoes show the plate boundaries and ocean floor features.

continents across the earth Shifted over time.

Inner core - Iron Fe, outer core Iron and Nickel, mantle, crust - oxygen O and silicone Si

Fossils, puzzle fit, glacial grooves, rock strata, mountain belts, deep sea trenches, mountain building, new land formation, etc.

Oceanic crust is denser, younger, and thinner than continental crust.

Plate tectonics is the theory that explains how large pieces of the earth's crust, called tectonic plates, move and change shape.

Solid outer layer of the earth that consists of the crust and the rigid upper portion of the mantle.

Subduction is when one lithospheric plate descends beneath another

inner core and outer core

Oceanic crust is denser, younger, and thinner than continental crust.

Locations of earthquakes and volcanoes show the plate boundaries and ocean floor features.

Inner core - Iron Fe, outer core Iron and Nickel, mantle, crust - oxygen O and silicone Si

soft layer, hard layer

Mantle , crust

the soft layer of the mantle on which the tectonic plates move.

the strong lower part of the mantle between the asthenosphere and the outer core.

Solid outer layer of the earth that consists of the crust and the rigid upper portion of the mantle.

the soft layer of the mantle on which the tectonic plates move.

the strong lower part of the mantle between the asthenosphere and the outer core.

Convection currents in the mantle

Convection currents in the mantle

the strong lower part of the mantle between the asthenosphere and the outer core.

Solid outer layer of the earth that consists of the crust and the rigid upper portion of the mantle.

Inner core - Iron Fe, outer core Iron and Nickel, mantle, crust - oxygen O and silicone Si

Fossils, puzzle fit, glacial grooves, rock strata, mountain belts, deep sea trenches, mountain building, new land formation, etc.

Convection currents in the mantle

Oceanic crust is denser, younger, and thinner than continental crust.

its Thicker

Basalt