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Modified T/F Modified T/F Multiple Choice Multiple Choice Completion

Some early mapmakers thought that the coastline of South America matched the coastline of Asia. A 100

False; Africa A 100

DAILY DOUBLE A 200 DAILY DOUBLE Place A Wager

Convection currents in the mantle produce a force that causes motion called slab pull. A 200

False; basal drag A 200

As new seafloor moves away from an ocean ridge, the seafloor cools and becomes more dense than the material beneath it. A 300

True A 300

If two continental plates converge, a subduction zone forms. A 400

False; mountain A 400

The weight of a subducting plate helps to pull the lithosphere into a subduction zone in a process called slab pull. A 500

True A 500

The circulation of material caused by differences in density is called convection. B 100

True B 100

Scientists at the time rejected Wegener’s hypothesis of continental drift because he could not explain how or why Earth’s continents move. B 200

True B 200

According the theory of plate tectonics, plates interact at plate boundaries by deflecting each other, moving away from each other, or moving horizontally past each other. B 300

False; coming toward B 300

Ridge push moves lithosphere in opposite directions away from the mid-ocean ridge. B 400

True B 400

Normal polarity is a state in which magnetized objects orient themselves to point south. B 500

False; Reversed B 500

The youngest rocks on the ocean floor are located ____. a. near continents b. at mid-ocean ridges c. far from mid-ocean ridges d. near Asia C 100

The youngest rocks on the ocean floor are located ____. a. near continents b. at mid-ocean ridges c. far from mid-ocean ridges d. near Asia

The crust and upper mantle make up Earth's ____. a. lithosphere b. asthenosphere c. core d. continents C 200

The crust and upper mantle make up Earth's ____. a. lithosphere

Plates of the lithosphere float on the ____. a. crust b. asthenosphere c. core d. atmosphere C 300

Plates of the lithosphere float on the ____. a. crust b. asthenosphere c. core d. atmosphere

While studying the ocean floor, scientists found ____ bands of magnetism. a. plastic b. alternating c. no d. rectangular C 400

While studying the ocean floor, scientists found ____ bands of magnetism. a. plastic b. alternating c. no d. rectangular

The hypothesis that continents have slowly moved to their current locations is called ____. a. continental drift b. continental slope c. magnetic reversal d. convection C 500

The hypothesis that continents have slowly moved to their current locations is called ____. a. continental drift

The result of plate movement can be seen at ____. a. abyssal plains b. ocean margins c. plate centers d. plate boundaries D 100

The result of plate movement can be seen at ____. a. abyssal plains b. ocean margins c. plate centers d. plate boundaries

A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called ____ once existed. a. Glomar b. Glossopteris c. Pangaea d. Wegener D 200

A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called ____ once existed. a. Glomar b. Glossopteris c. Pangaea d. Wegener

DAILY DOUBLE D 300 DAILY DOUBLE Place A Wager

Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____. a. century b. decade c. day d. year D 300

Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____. a. century b. decade c. day d. year

Scientists believe that differences in ____ cause hot, plastic-like rock in the asthenosphere to rise toward Earth's surface. a. density b. magnetism c. weight d. composition D 400

Scientists believe that differences in ____ cause hot, plastic-like rock in the asthenosphere to rise toward Earth's surface. a. density

The driving forces of tectonic plates are related to convection currents in Earth’s ____. a. crust b. mantle c. inner core d. outer core D 500

The driving forces of tectonic plates are related to convection currents in Earth’s ____. a. crust b. mantle c. inner core d. outer core

____________________ occurs when one tectonic plate descends beneath another. E 100

Subduction

Places where plates move apart are ________ plate boundaries. E 200

divergent

The theory of ___________________ explains how new crust is created at mid-ocean ridges. E 300

seafloor spreading E 300

The arrows in the mantle and oceanic crust indicate the direction of flow of _________________ beneath the plates. E 400

convection currents E 400

____________________ is the process occurring in the area marked by the letter R. E 500

Ridge push E 500

Earth’s continents were once joined as a single landmass called ____________________. F 100

Pangaea F 100

Plates come together at _____________ plate boundaries. F 200

convergent F 200

___________ plate boundaries are places where plates slide horizontally past each other. F 300

Transform F 300

F 400 A(n) ____________________ is used to measure and record the magnetic signature of the rocks on the seafloor.

F 400 magnetometer

F 500 ____________________ is the process taking place in the area marked by the letter S.

F 500 Slab pull

The Final Jeopardy Category is: Plate Tectonics Please record your wager. Click on screen to begin

How does a mid-ocean ridge form? Click on screen to continue

As the seafloor spreads apart, magma moves upward and flows from the cracks. It becomes solid as it cools and forms new seafloor. As new seafloor moves away from the ridge, it cools, contracts, and becomes denser than the material below it. This dense, colder seafloor begins to sink, helping to form the mid-ocean ridge.

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