a scientist who studies the forces that make and shape planet earth
a lump or mass of hard consolidated mineral matter
The scientific study of the origin, history, and structure of the earth.
a force that builds up mountains and landmasses on Earth's surface
a force that slowly wears away mountains and other features on the surface of Earth
one of the large landmasses of the earth
A vibration that travels through earth carrying the energy released during an earthquake
the force applied to a unit area of surface
the outer layer of the Earth
A dark, dense, igneous rock with a fine texture, found in oceanic crust.
A usually light colored igneous rock that is found in continental crust
the layer of the earth between the crust and the core
the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
The solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it
the liquid layer of the Earth's core that lies beneath the Mantle and surrounds the inner Core
a dense sphere of solid iron and nickel at the center of Earth
An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
Sea- Floor Spreading
when two oceanic plates pull apart, magma rises and new crust is formed
a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
a rigid layer of the Earth's crust that is believed to drift slowly
A well tested explanation for a wide range of observations or experimental results
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
the boundary between tectonic plates that are sliding past each other horizontally
the boundary between two tectonic plates that are moving away from each other
A tectonic plate boundary where two plates collide, come together, or crash into each other.
the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations