Class Notes (839,394)
Canada (511,324)
EESA06H3 (570)
Nick Eyles (502)
Lecture 7

Lecture 7

6 Pages

Environmental Science
Course Code
Nick Eyles

This preview shows pages 1 and half of page 2. Sign up to view the full 6 pages of the document.
EESA06 Lecture 7 Page 1 EESA06 Lecture 7 Galapos Islands J in Equador, hotspots - Hotspot trails J old dead volcanoes, flat tops (from erosion), below seas level, dead volcano - Hotspots J majority occur on oceanic plates - Relative Ages of islands: the youngest island above the hotspot, eventually go under sea level, systematic aging of the rocks as you go down the trail - Gives us a clue of plate movement - Bathymetric J map that shows water depths - Islands after 3 million years become completely submerged - Phreatomagmatic J water + volcanic activity, violent releases - Geologists like this area because there is No vegetation = young landscape, still actively evolving - Barrel Cactus are the pioneerfirst plants grow in cracks of lava, o Prickly pear cactus another pioneer plants, eaten by giant tortoises, evolution of long wooden stems to avoid being eaten o Blue footed booby J bird with nostrils underneath eyes, due to evolution - Aa lava (rocky), pohoehoe lava (ropey) - Pyroclastic layers of ash that falls on the land that blows out underwater, think of a Zsnow avalanche[ZZLZL water - laminated sediments - Scoria J large pieces of burnt rock found around cinder cones - Trace fossil J track of organism, like footprints, turtle tracks to lay eggs Rocks and Minerals: Clues to Ancient Environments - Lithification J to turn a sediment into rock - Compaction J to squeeze water and air out of something Differences Between Rocks and Minerals - Rock J is a naturally formed consolidated material, composed of grains of one or more minerals - Mineral J is a naturally occurring, inorganic, crystalline solid that has a definite chemical composition. They are the building blocks of rocks. - Igneous rocks J to be born of fire, extrusive and intrusive - Crystallography J the study of different shapes of crystal and diagnostic diff mineral types Minerals 4,500 different types but - The most important group are the silicate minerals containing silicon and oxygen and accounts for 90% of all minerals. Few minerals dominate ex: o Quartz J (silica = Si2 = silicon plus oxygen) o Olivine (Mg, Fe SiO 4 J mantle o Feldspars (largest subgroup, shiny field crystals, common in shield rocks, composite soil, semi- precious stones) - crust o Pyroxenes (ex: augite) o Mica o Clay minerals such as kaolinite, montmorillonite J result of weather of other minerals, electrical properties, dictate whether soil is fertile or not
More Less
Unlock Document

Only pages 1 and half of page 2 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

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.