Introduction
Our Place in the Universe
The Nebular hypothesis
A. solar nebula
B. contraction into rotating disk
C. Cooling causing condensing into tiny (dust sized) solid particles
D. Collisions between these form larger bodies
E. These accrete to form planets
I. The Earth is a system
II. People and the EnvironmentA. Systems - a group of interacting and interdependent parts that form a complex whole
B. HydrosphereFeedback mechanisms
1. Global oceanC. Atmospherea) 71% of the Earth’s surface
b) 97% of its water
2. Cryosphere (Ice)
a)most of your “fresh” water1. gaseous envelope - thinD. Lithospherea) the air you breath
b) protection
c) energy exchanger1. “solid” EarthE. Biospherea) crust2. Two principal divisions
b) mantle
c) corea) ocean basins(1). mid-ocean ridge system - 65 x 103kmb) continents
(2). trenches - some >11x103 km(1) Continental shelf - 1/2 way
(2)this changes the % to 60/401. all life and the previous “spheres”F. Interface - common boundary where different parts of a system come into contact and interact.
A. Environment - everything that surrounds and influences an organismIII. Resources1. biotic - livingB. Environmental hazards - these are natural processes, people are the problem!!
2. abiotic - non livinga) also called the physical environment - this is Earth Science!
A. renewable - replenished over a relatively short period of timeIV. What is SCIENCE?1. plants, animals (um um good!)B. nonrenewable - replenished beyond human time scale
2. flowing water
3. wind
4. solar1. coal
2. petroleum
3. metals
A. Underlying assumption - the natural world behaves in a consistent and predictable manner.
B. FACTS - come from observation and measurement1. standard measuresC. Hypothesis
2. observer dependent1. explanations of factsD. Theory
2. there can be more than one for the same set of facts1. when only one hypothesis is left after lots of testingE. Laws
2. high confidence - predictability
3. best testable explanation at that time
4. decided by scientists1. describes what will happenF. Scientific Methodology
2. does NOT explain why1. There is NO one Scientific MethodG. General Guides for sciencea) collect facts2. Serendipity
b) form hypothesis
c) construct experiments (test)
d) accept, modify or reject1. testable
2. Replicable
3. falsifiable
4. peer reviewed
5. changes with time (tentative)
6. product of culture
Images are from your T&L text - use low res if printing the pages out as notes