Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download PLATE TECTONICS Plate tectonics: Earth`s major tectonic plates
Document related concepts
Transcript
PLATE TECTONICS Plate tectonics: Earth’s major tectonic plates make up 14 plates. Drifting Continents: Reasons: 1) Similarities of types of rock 2) Distribution of fossil species 3) Other lines of evidence 225 Million Years ago, all continents were in one: Pangea moving 6 cm per year: steady slow movement of tectonic plates over the intervening time by break up of Pangea, and brought continents to their present position. In the future, San Francisco and LA will be next to each other. Magma: hot stuff in asthenosphere Lava: magma on surface of lithosphere HAZMATS Hazmats: Hazardous Material: Toxicology: The study of harmful effects of chemicals on human and environmental health. Toxicity: acute: sudden Chronic: over a period of years Carcinogenic: cancer- causing Threshold level: the level below which no ill effects are observed Dose: The amount of chemical taken at once. Response: The effect The nature of chemical hazards: Hazmats: 1) Ignitability: Substances that catch fire readily (e.g. gasoline and alcohol) 2) Carrosivity: Substance that corrodes storage tanks and equipment (e.g. acids) 3) Reactivity: Substance that are chemically unstable and may explode or create toxic fumes when mixed with water (e.g. explosives, elemental phosphorus and concentrated sulfuric acids) 4) Toxicity: Substances that are injurious to health when they are ingested or inhaled (e.g. Chlorine gas, ammonia, pesticides and formaldehyde). 5) Radioactivity material: Cause radioactivity emissions: alpha particle or helium nucleus, beta particle or electrons, gamma rays or electromagnetic radiation (e.g. uranium, radium, plutonium) Authorities: Environmental Protection Agency (EPA): A federal agency with environmental protection regulatory and enforcement authority. Occupational Safety and Health Administration (OSHA): Part of US department of Labor. The regulatory and enforcement agency for safety and health in most US industrial sectors. Air Quality Management District (AQMD): Smog Control agency American Conference of Governmental Industrial Hygienists (ACGIH): An organization of professionals engaged in occupational safety and health programs. The Material Safety Data Sheet (MSDS) Geological time scale Formation of Earth 4600 million years ago Archean: Oldest microfossils 2500 mya Water-based life First eukaryotes (having nucleus) Protezoic: 580 mya Cambrean: First vertebrates 530 mya Ordovician Silurian: Land Plants 438 mya Fish, Mass extinction Devorean: Amphibians, mass extinction Carboniferous: Reptiles Permean: Triassic: turtle 367 mya 350 mya 248 mya 220 mya Jurassic: Flowering plants, mammals, birds, and dinosaurs Cretaceous: Mass extinction of life 75 mya Tertiary: Early primates, primitive whales, bats 50 mya Homohabilus: 2 mya 180 mya
