Ees 101 Iii--5Th Column

Front 1

Continental Drift

Back 1

s the movement of the Earth's continents relative to each other.

Front 2

Alfred Wegener

Back 2

hypothesized that the continents were slowly drifting around the Earth. However, his hypothesis was not accepted until the 1950s, when numerous discoveries such as palaeomagnetism confirmed his hypothesis of continental drift.[1][2]

Front 3

Fit of Continents

Back 3

proved that the continents once were together

Front 4

Locations of past Glaciations

Back 4

used to prove that continents were once together

Front 5

Sea-Floor Bathymetry

Back 5

Bathymetry is the study of underwater depth of lake or ocean floors.

Front 6

Guyots

Back 6

also known as a tablemount, is an isolated underwater volcanic mountain (seamount), with a flat top over 200 meters (660 feet) below the surface of the sea.

Front 7

Seamounts

Back 7

is a mountain rising from the ocean seafloor that does not reach to the water's surface (sea level), and thus is not an island.

Front 8

Isostacy

Back 8

is a term used in geology to refer to the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and density. This concept is invoked to explain how different topographic heights can exist at the Earth's surface.
**restores equilibrium

Front 9

Paleomagnetism

Back 9

The branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation

Front 10

Apparent Polar Wander

Back 10

is the imaginary movement of the Earth's magnetic poles relative to a continent while regarding the continent being studied as fixed in position, as determined by paleomagnetic data.[1] It is used in the study of plate tectonics to interpret how continents move, join and split as they drift across the Earth's surface.[1]

Front 11

Active Margin

Back 11

are found on the leading edge of a continent where subduction occurs.

Front 12

Passive Margin

Back 12

A passive margin is the transition between oceanic and continental crust which is not an active plate margin.

Front 13

Hot Spot

Back 13

volcanic regions thought to be fed by underlying mantle that is anomalously hot compared with the mantle elsewhere. They may be on, near to, or far from tectonic plate boundaries.

Front 14

Thermal Plume

Back 14

hot spot. Mantle plume.

Front 15

Ridge Push

Back 15

sliding plate force is a proposed mechanism for plate motion in plate tectonics. Because mid-ocean ridges lie at a higher elevation than the rest of the ocean floor, gravity causes the ridge to push on the lithosphere that lies farther from the ridge.

Front 16

Slab Pull

Back 16

tectonic plate force due to subduction. Plate motion is partly driven by the weight of cold, dense plates sinking into the mantle at trenches.[1][2] This force and the slab suction force account for most of the overall force acting on plate tectonics, and the ridge push force accounts for 5 to 10% of the overall force.[3]