Earth Science - Chapter 9 - Etna FFA Agriculture

Name

Date

(Key # 1 - 865129)

Earth Science - Chapter 9

Complete the crossword puzzle.

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HOTSPOT CONTINENTALVOLCANICARC PALEOMAGNETISM REVERSEPOLARITY TRANSFORMFAULTBOUNDARY SUBDUCTIONZONE SEAFLOORSPREADING PLATE DIVERGENTBOUNDARY OCEANICRIDGE NORMALPOLARITY

CONTINENTALDRIFT RIFTVALLEY SLAB-PULL VOLCANICISLANDARC TRENCH RIDGEPUSH PLATETECTONICS PANGAEA MANTLEPLUME CONVECTIVEFLOW CONVERGENTBOUNDARY

Across

2 boundary formed when two plates slide past each other in the same direction at different speeds, or slide past each other in opposite directions; the San Andreas Fault is an example. (3 words)

5 mountains formed in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent. (3 words)

8 This is where two plates are moving away from each other. New crust is formed here. (2 words)

9 the theory that magma from Earth's mantle rises to the surface at mid-ocean ridges and cools to form new seafloor (2 words)

10 an area in the middle of a lithospheric plate where magma rises from the mantle and erupts at the Earth's surface. Volcanoes sometimes occur above a hot spot. (2 words)

11 deep valley that forms where 2 (divergent) plates move apart (2 words)

12 A continuous elevated zone on the floor of all major ocean basins; the rifts at the crests of the ridges represent divergent plate boundaries. (2 words)

15 The study of changes in Earth's magnetic field, as shown by patterns of magnetism in rocks that have formed over time.

17 a mechanism that may contribute to plate motion; It involves the oceanic lithosphere sliding down the oceanic ridge under the pull of gravity. (2 words)

19 a magnetic field that is the same as that which exists at present (2 words)

20 Wegener's hypothesis that all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions. (2 words)

Down

1 Where two lithospheric plates come together, one riding over the other. Most volcanoes on land occur parallel to and inland from the boundary between the two plates (2 words)

3 a large section of Earth's oceanic or continental crust and rigid upper mantle (lithosphere) that moves around on the asthenosphere.

4 The theory that the earth's outer shell is composed of a number of large, unanchored plates, or slabs of rock, whose constant movement explains earthquakes and volcanic activity. (2 words)

5 the motion of matter resulting from changes in temperature (2 words)

6 a chain of volcanic islands generally located a few hundred miles from a trench where subduction of one oceanic slab beneath another is occurring. (3 words)

7 A plate boundary where two plates move toward each other. (2 words)

13 a magnetic field opposite to that which exists at present. (2 words)

14 a mechanism that contributes to plate motion in which cool, dense oceanic crust sinks into the mantle and "pulls" the trailing lithosphere along

15 The single giant landmass that existed more that 200 million years ago and that gave rise to the present-day continents.

16 a mass of hotter-than-normal mantle material that ascends toward the surface, where it may lead to igneous activity (2 words)

18 A long,deep, narrow area like a valley or canyon in the ocean floor.

Answer Key: Key # 1 - 865129

Earth Science - Chapter 9

Complete the crossword puzzle.

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