University:
Jackson College
Course:
GEO 131 | Physical Geography
Academic year:

2024
Views:

181

Pages:

2
Author:

Leonel Howell

Section 12.2 Features of Plate Tectonics Interpreting Illustrations Layers of the Earth Page 218 1. (a) inner core 2. (b) outer core (c) lower mantie (d) upper mantie (e) crust Layer (a) inner core (b) cuter core (c) lower mantie (d) upper mantle (e) crust Thicke 1216 km solid 2270 km liquid 2225 km sold 600 km solid, moisen 5-60 km solid, brittle General campcoition iron, nickal iron, nickal magnesium, itom iron, magnesium grante, basalt 3. The lithosphere is the layer made up of the crust and the uppermost mantle while the asthenosphere is a partly molten layer in Earth's upper mantle just below the lithosphere. Comprehension Features of plate tectonics Page 219 1. Geologists believe that the asthenosphere is heated by radioactive decay from large quantities of radioactive elements such as uranium. 2. Scientists hypothesize the mantle convection is one of the driving forces behind plate movement. 3. A rift valley occurs on land, while a spreading ridge pocurs in the ocean. 4. The heavy oceanic plate will dive deep under the lighter continental plate in an event known as subduction. 5. Earthquakes and volcanic eruptions occur at subduction zones. 6. (a) divergent (b) convergent (c) transform 7. Plate interaction 1. East African Hit divergence 2. Juan de Fuce plate 3. Islands of Japan oceanic-continental convergence oceanic-oceanic convergence 4. Himalayan mountains 5. San Andreas Fault continents-continental convergence Iransform fault 8. Subduction does not occur when continental plates collide. The plates have similar densities so this prevents either one from being forced down into the mantle. Applying Knowledge Seismic waves, earthquakes, and volcanoes Page 220 1 Seismic wave Abbreviation General wave primary wawe Descriptias of action Type of material through Speed it trovain at ground squeeze and stretches solds, quide, fast ground motion is perpend cular to diraation of warve travel solids, but not quies lower secondary 5 wave rolling action solids slowest surface wave 2. A seismometer is a device that measures the amount of ground motion caused by an earthquake. 3. Magnitude is a number that rates the strength (energy) of an earthquake. Higher magnitude numbers indicate larger, more devastating earthquakes. 4. The Richter scale is often used to measure the magnitude of an earthquake. 6. The focus is the location inalde Earth where an earthquake starts, and the epicentre is the point on Earth's surface directly above the focus. 2008 McGill Ryerson Limited Workbook Answers MHR 29

Plate Tectonics Workbook Answers

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