GLG205 Lecture 1

2 Pages
Unlock Document

Earth Sciences
Bridget Bergquist

GLG205 Lecture 1: Jan 10 , 2013 EARTH SYSTEM: Each system needs matter and energy Earth system has 4 major parts: - Atmosphere: a mixture of gases - Lithosphere: upper part of the solid earth - Hydrosphere: the total water on Earth - Biosphere: living and dead organic matter Two sources of energy for Earth system: - External energy: radiation from the Sun, drives the water cycle and wind cycle - Internal energy: caused within the Earth by radioactive decay (e.g. plate movements) Types of Change: - Gradual: slow over millions/ billions of years - Catastrophic: fast from seconds to centuries - Unidirectional: irreversible change (formation of earth) - Cyclic Rising human pop requires ENERGY and RESOURCE CONSUMPTION  Result: ozone hole, air/ water pollution, deforestation, etc GEOLOGICAL TIME Universe created by a big explosion: THE BIG BANG  Hot clouds of hydrogen and helium formed giving rise to the stars and the planets Evolution of Earth: HADEAN 4.5 – 3.8 billion years ago - Radioactive decay caused melting of the early Earth  leading to internal differentiation: heavy elements (iron, nickel) settled in the inner core, lighter elements settled on the outside forming the mantle - Atmosphere had lots of gases especially CO2 (kept the earth warm in the absence of ozone layer) and no oxygen ARCHEAN 3.8 – 2.5 bya - At 2.4 bya,
More Less

Related notes for ESS102H1

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.