geophysics lec 2 earth as a planet

internal origin resulting in volcanism and tectonism

• Endogenic Process

• Exogenic processes

of external origin such as erosion and deposition

• Endogenic Process

• Exogenic processes

__in size and mass of the Solar System’s four terrestrial planets. Has the ___ density, the __ surface gravity, the __ magnetic field, and

__ rotation.

• smallest, highest, highest, slowest

• largest, highest, highest, strongest, fastest

• smallest, lowest, lowest, weakest, slowest

• largest, lowest, highest, weakest, fastest

a meteorologist and geologist, suggested that all of the continents were together forming a single landmass. He believed, in the face of strong opposition from physicists, that the Earth’s geographic axis had moved with time, instead of the crust moving relative to the fixed poles. The continents drift through the ocean crust like ships through water. "Continental Drift".

-the large-scale horizontal displacement of crustal blocks having continental dimensions.

used a computer to match the relative positions of the continents bounding the Atlantic ocean. The optimum fit is not perfect, but has some overlaps and gaps.

• 1965: E. C. Bullard, J. E. Everett, and A. G. Smith

• A.G. Smith and A. Hallam

• 1961: Robert Dietz

• 1962: Harry Hess

used the same computer-assisted technique to match the coastlines of the southern continents. they obtained an optimum geometric reconstruction of Gondwanaland It is not the only possible good geometric fit, but it also satisfies other geological evidence.

• 1965: E. C. Bullard, J. E. Everett, and A. G. Smith

• A.G. Smith and A. Hallam

• 1961: Robert Dietz

• 1962: Harry Hess

-Geophysicist and Oceanographer

-he coined the expression “seafloor spreading” for the ridge process

• 1965: E. C. Bullard, J. E. Everett, and A. G. Smith

• A.G. Smith and A. Hallam

• 1961: Robert Dietz

• 1962: Harry Hess

-US Navy Officer and geologist

-he suggested that new oceanic crust is generated from upwelling hot mantle material at the ridges

• 1965: E. C. Bullard, J. E. Everett, and A. G. Smith

• A.G. Smith and A. Hallam

• 1961: Robert Dietz

• 1962: Harry Hess

From the magnetization direction, it is possible to calculate the position of the magnetic pole at that time; this is called the VGP position. Paleomagnetism developed as a geological discipline in the 1950s and 1960s. What does VGP mean?