ENV 110 Lecture Notes - Lecture 2: Basalt, Mafic, Intermediate Composition

37 views2 pages

8 Jun 2018

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Environmental Studies - Lecture 3

Global Change

• Plastic asthenosphere permits tectonic plate motion

• Star warm enough to warm Earth and atmosphere (habitable zone)

• Liquid is possible allowing weathering and erosion

• Biotic evolution continually modifies the biosphere

Earth System

• Four descriptions of change

▪ Gradual – time variable

▪ Catastrophic – extinction

▪ Unidirectional – Evolution of Earth or Formation of Moon, go forward and never

backwards

▪ Cyclic – Supercontinent cycle, works in a cycle

Supercontinent

• Plate tectonics drives continental movement

• Ocean basins open and close

Physical Changes

• Sea level +/- 300 meters

Layer of the Earth

• Deeper one goes; higher the temperature, higher the pressure

• Crust: thickest under Mount Range (40 miles), thinnest under mid-ocean ridge (4 miles)

find more resources at oneclass.com

Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Get access