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7thGrInsideCh1Sec3-5
7th Grade Inside Earth Chapter 1 Sections 3-5
Question | Answer |
---|---|
continental drift | the continents slow movement over Earth's surface |
fossil | any trace of an ancient organism preserved in rock |
sonar | a device that bounces sound waves off underwater objects and records the echoes of the sound waves |
deep-ocean trenches | underwater canyons |
subduction | proces by which ocean floor sinks beneath a deep-ocean trench and back into the mantle |
plates | the separate sections of the lithosphere |
scientific theory | well tested concept that explains a wide range of observations |
plate tectonics | pieces of Earths's lithosphere are in slow, constant motion, driven by convection currents in the mantle |
faults | breaks in Earth's crust where rocks have slipped past each other |
divergent boundary | place where two plates move apart |
rift valley | deep valley formed along the divergent boundary |
convergent boundary | place where two plates come together |
transform boundary | place where two plates slip past each other moving in opposite directions |