1 / 10

Our Changing Earth: Part I

Our Changing Earth: Part I. Fun Earth Facts. Highest mtn: Mt. Everest 8,848m Lowest point: Dead Sea 393m bsl Longest river: Nile 6,690km Largest desert: Sahara 9,000,000 km sq. 3 Types of Rocks. Sedimentary: Rocks made of sediments (soil, sand, other rocks)

aaron
Download Presentation

Our Changing Earth: Part I

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Our Changing Earth: Part I

  2. Fun Earth Facts Highest mtn: Mt. Everest 8,848m Lowest point: Dead Sea 393m bsl Longest river: Nile 6,690km Largest desert: Sahara 9,000,000 km sq.

  3. 3 Types of Rocks • Sedimentary: Rocks made of sediments (soil, sand, other rocks) • Metamorphic: Rocks made of existing rocks under heat and pressure • Igneous: Rocks from lava or molten rock (from volcanoes)

  4. Geologic Time Scale • Definition: Chart used to describe the earth’s history through time • The time periods of the earth are divided into 4 main eras: * Precambrian: largest era * Paleozoic * Mesozoic * Cenozoic

  5. Putting the Pieces Together: Part II • Wegener: meteorologist who theorized that the continents were once joined together in a single continent • Pangaea: name given to the “supercontinent” described by Wegner

  6. Putting the Pieces Together (cont.) • Theory of continental drift: Wegner’s theory that continents known today were once joined together as one *Based on : fossil evidence, shapes of cont. fitting together, and study of climates • Plate: large masses of the earth’s crust moving in various directions—they “ride” on the mantle • Plate tectonics: the theory of how the continents move, based on Wegner’s theory of continental drift

  7. The Layers of the Earth Part III 1. Crust: the thin, rocky, outer portion of the earth’s surface 2. Mantle: composed of 2 layers a. Lithosphere: where plates are b. Asthenosphere: slushy layer 3. Core: solid, inner layer (almost pure iron)

  8. Moving Plates: Part IV *Currents in the mantle that move the plates are caused by heat Plates can move in one of 3 ways: 1. Converge/Collide: approach each other/hit * when they collide, they form: a. Trench (deep valley) where old crust is re-cycled

  9. Moving Plates: Part IV b. Volcanoes c. mountains 2. Separate: move away from each other *causes deep cracks called rifts to form ex. mid-ocean ridge & Great Rift Valley

  10. Moving Plates cont. *sea-floor spreading: a process during which new ocean crust is formed at mid- ocean ridges (large mountains on ocean floor where new crust is formed) *On the ocean floor at the spreading center, new crust is formed • Slide past each other *faults form like the San Andreas Fault *earthquakes are common along these plate boundaries

More Related