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Earth Science Grade 6
Chapter 4 Plate Tectonics
Instructions: Complete the crossword puzzle. Use the clues to help identify the words.
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Across
1.
core: A layer of molten iron and nickel that surrounds the inner core of Earth.
4. convection
another.
6.
7.
: The movement of a fluid that transfers heat from one part of the fluid to
core: A dense sphere of solid iron and nickel at the center of Earth.
A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of
continental and oceanic crust.
9. A trace of an ancient organism that has been preserved in rock.
13.
A break or crack in Earth’s lithosphere along which the rocks move.
14.
continental
15.
16.
: The hypothesis that the continents slowly move across Earth’s surface.
boundary: A plate boundary where two plates move toward each other.
plate
: The theory that pieces of Earth’s lithosphere are in constant motion, driven
by convection currents in the mantle.
18. The force exerted on a surface divided by the total area over which the force is exerted.
20. The layer of hot, solid material between Earth’s crust and core.
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2.
deep-ocean : A deep valley along the ocean floor beneath which oceanic crust slowly
sinks toward the mantle.
3.
mid-ocean
4.
The layer of rock that forms Earth’s outer surface.
5.
valley: Valley form where plates move apart.
: An undersea mountain chain where new ocean floor is produced.
7.
Landmass that broke apart 200 million years ago and gave rise to today’s continents.
8.
The soft layer of the mantle on which the lithosphere floats.
10.
Device to determine the distance of an object under water by recording echoes of sound
waves.
11.
spreading The process by which molten material adds new oceanic crust to the ocean
floor.(two words; no hyphen)
12.
The process by which oceanic crust sinks beneath a deep-ocean trench and back into
the mantle at a colliding plate boundary.
14.
The amount of mass of a substance in a given volume; mass per unit volume.
15.
The direct transfer of heat between two substances that are touching.
17.
boundary: A plate boundary where two plates move away from each other.
19.
waves: Vibrations that travel through Earth carrying the energy released during an
earthquake.
Asthenosphere
Mid-ocean ridge
Colliding boundary
Basalt
Convection currents
Plate tectonics
Crust
Density
Scientific theory
Granite
Continental drift
Fault
Inner core
Sea-floor spreading
Rift valley
Lithosphere
Fossil
Spreading boundary
Mantle
Pangea
Sliding boundary
Outer core
Sonar
Plate
Pressure
Convection
Subduction
Radiation
Deep-ocean trench
Seismic waves
Conduction
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