Geologictime (19)

Geologictime (19) - Primitive atmosphere: Most likely...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Primitive Earth Primitive atmosphere: Most likely consisted of: - H 2 O vapor, Nitrogen, CO 2 - Small amounts of H 2 and CO Little free oxygen Originally too hot for liquid water As earth cooled, water vapor condensed to liquid water Monomers evolved and joined to form Polymers Protein or RNA first? Clay hypothesis?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Origin of the 1st Cell
Background image of page 2
Fossil Dating Fossils = Remains and traces of past life Paleontology is the study of the fossil record Most fossils are traces of organisms embedded in sediments Sediment converted to rock Becomes recognizable stratum in stratigraphic sequence of rocks Strata of the same age tend to contain the similar fossil assemblages Helps geologists determine relative dates of
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
older younger Strata
Background image of page 4
Fossils
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Fossil Dating - Absolute One absolute dating method relies on radio (radioactive) dating techniques Half-life: The length of time required for half the atoms to change into something else Unaffected by temperature, light, pressure, etc. All radioactive isotopes have a dependable half life
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

Page1 / 16

Geologictime (19) - Primitive atmosphere: Most likely...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online