Thẻ ghi nhớ: Unit 6: Earth Physics (0893 Cambridge Science, Stage 7) | Quizlet
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35 Terms
speed of sound
The speed at which a sound wave travels through a given material
backwards and forwards
In both directions alternately, to and fro.
loudness
a sound's intensity
pitch
a sound's highness or lowness; depends on frequency
particles
A very small piece or part; a tiny portion or speck
sound wave
a longitudinal wave that can travel only through matter
medium
Material through which a wave travels
property
Characteristic used to describe something
reflected
bounced off
echo
a reflected sound wave
unwanted
not desired or wished for
crust
The thin and solid outermost layer of the Earth above the mantle, composed of rock.
mantle
The layer of hot, solid material between Earth's crust and core.
core
The central part of the earth below the mantle
molten
made liquid by heat; melted
continental drift
the gradual movement of the continents across the earth's surface through geological time.
tectonic plates
Large movable plates under the Earth's surface.
magma
Molten rock beneath the earth's surface
plate boundaries
the edges of tectonic plates.
subduction
One plate going under another plate
fold mountains
When two plates collide and rocks in the crust push up
earthquake
The shaking that results from the movement of rock beneath Earth's surface.
magnitude
Measure of the energy released during an earthquake
lava
Liquid magma that reaches the surface; also the rock formed when liquid lava hardens.
volcanoes
an opening in the Earth's crust through which molten lava, ash, and gases are ejected.
active
said of a volcano that is erupting or has shown signs of erupting in the near future
inactive (dormant)
A type of volcano that could erupt but has not erupted for more than 10,000 years.
extinct
a volcano that will not erupt again
opaque
(adj.) not letting light through; not clear or lucid; dense, stupid
shadow
An area from which light is blocked.
rays
A straight line used to represent a light wave.
solar
relating to the sun
eclipse
The partial or total blocking of one object in space by another
partial
incomplete
lunar
relating to the moon