EESC1180 Lecture 1: L1_ Intro to Earth Sciences_

• School: Boston College
• Department: Earth & Environmental Sciences
• Course: EESC1180
• Professor: Ken Galli

Document Summary

Geologic time: span of time since earth"s formation. Geologic time scale: divides history of earth into different units. 87% of geologic time there was no visible life. Paradigm: theory that explains larger number of aspects in the natural world. Theories that withstand examination or totally unexpected occurrences. Origin of the earth: most researchers believe earth and other planets formed at the same time. Nebular theory: solar system evolved from really large cloud or nebula which was made of hydrogen and helium. Accretionary disk: diffused material spinning about what would become a star.