Bellwork • Get Textbook—Chapter 2 • Scientists have evidence that the center of the earth is active with intense heat and pressure. Movements deep within the earth cause changes to the earth’s surface • What is the interior of the earth like?
Haley’s Comet Asteroids
Asteroids • Where & when did the asteroid kill off the dinosaurs? • What was the immediate impact of the asteroid hit? • How did the asteroid bit change life on earth and how long did the effects last? • What continents were affected most?
Answers • -near Yucatan Peninsula • Impact- dug a huge crater, vaporized limestone and seawater, created a fireball-thousands of miles • Changes-skies darkened for several months, acid rain poisoned lakes and rivers-705 species died • Greenhouse existed –plants/animals survived • North/south America
Earth’s water • When you turn a faucet on, do you ever wonder where the water comes from? What is the source of the water you use to drink, cook and bathe?
Water- 70% • Liquid- rivers, lakes, oceans • Gas- atmosphere ---water vapor • Frozen- glaciers & ice sheets
Desalination- • Water in oceans- very salty • Process-called desalination-removing of salt content….becomes freshwater • Impact- of water • Meets everyday needs • Towns-urban areas developed along shore/lakes • Groundwater-beneath earth(rain &melted snow • Aquifers-underground porous rocks
Water Cycle • Evaporation—changing liquid into vapor/gas • Condensation- warm air cools, changes back into liquid water-forms clouds • Precipitation- rain/snow/sleet- falls to the ground • Surface Runoff- water collects in rivers, lakes and oceans • http://education.jlab.org/reading/water_cycle_r.html
Question • Create a diagram showing the four main stages of the water cycle
East African Rift
The Indian Plate vs. The Eurasian Plate
Red- convergent Green – divergent Purple - transform
Cali 1994 6.7
Cali ‘94 6.7
Alaska 1964 9.3