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Lecture 1

Origins

QuestionAnswer
When was our solar system formed? about 4.5 billion years ago
What sort of state was our solar system like in the beginning? gassy
Earth is rocky/solid making it a what sort of planet? Terrestrial Planet
Gravity pulled what two elements inward to form the present day Earth's core? iron and nickel
Lighter elements rose to the surface forming what two parts of the Earth? the mantle and crust
The Earth's core remains partially molten through what? Radioactive Decay
Early atmosphere was composed mostly of what 8 things? water vapor. nitrogen gas. carbon dioxide. methane. carbon monoxide. sulfur dioxide. HCl. ammonia.
What elements was not in the early atmosphere? oxygen
What is a major determinant of the salinity of the ocean? chlorine
The ocean is estimated to how many years old? about 3.8 billion years old
What two conditions are critical to development of life? lack of oxygen and the presence of water
Cells are composed of proteins, carbohydrates, lipids, nucleic acids, etc that are assembled from using what from the environment? energy
The two scientists that created the early atmosphere model where? Miller, Urey
Earliest forms of life on Earth arose when? about 3.8 billion years ago
Early cells were? prokaryotic, probably just membrane bags of self-replicating RNA, DNA, other molecules.
Populations diverged in two major directions... Archaea and Eukarya (Eukaryotes), Bacteria
Percentages of present-day atmosphere... 78% Nitrogen, 21% Oxygen, <1% Argon, <0.03% Carbon Dioxide
Created by: rachelaurenk