Worksheets8th Grade Science Mid-Term Vocabulary
Total questions: 20
Worksheet time: 10mins
galaxy
a system of stars and associated matter held together by gravitational attraction
a large body of ice and dust in space
a cluster of planets orbiting a star
a type of celestial event involving supernovae
Subduction Zone
The region where oceanic plates sink down into the asthenosphere.
A place where tectonic plates slide past each other.
An area where continental plates collide and create mountains.
A zone where oceanic plates are formed at mid-ocean ridges.
Frequency
the number of times a wave passes a certain point in a given amount of time
the speed at which a wave travels through a medium
the distance between two consecutive peaks of a wave
the total energy carried by a wave
chemical change
a change in matter that produces a new substance
a physical alteration without changing the substance
a process that only involves temperature changes
a reaction that can be easily reversed
Newton's 1st Law
the tendency of an object to resist change in motion unless acted upon by an outside net force
an object in motion stays in motion unless acted upon by a force
the force acting on an object is equal to the mass of the object times its acceleration
for every action, there is an equal and opposite reaction
Transform Boundary
A plate boundary where two plates move past each other in opposite directions
A plate boundary where two plates collide and create mountains
A plate boundary where two plates move away from each other
A plate boundary that causes volcanic activity
homogeneous mixture
A mixture in which substances are evenly distributed throughout the mixture, uniform
A mixture where the components are easily distinguishable
A mixture that contains only one type of substance
A mixture that has a variable composition
Continental Drift Theory
A theory that suggests continents are fixed in their positions
A theory proposed by Alfred Wegener that the continents have not always been in their present locations but have moved there over millions of years
A hypothesis that explains the formation of mountains due to tectonic plates
A concept that states oceans are expanding and continents are sinking
Pangaea
The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
A type of ancient dinosaur
A geological term for volcanic activity
The name of the first human civilization
base
a compound that produces hydroxide ions in solution
a compound that produces hydrogen ions in solution
a compound that has a sour taste
a compound that turns red litmus paper blue
Wavelength
the linear distance between identical points on successive waves
the frequency of a wave
the amplitude of a wave
the speed of a wave
surface tension
the force that acts on the surface of a liquid, the cohesive property of water that causes it to resist external force
the ability of a liquid to flow easily
the pressure exerted by a gas in a container
the temperature at which a liquid boils
Law of Superposition
The bottom rock layer and its fossils is the youngest and the top is the oldest.
The top rock layer and its fossils is the youngest and the bottom is the oldest.
All rock layers are of equal age regardless of their position.
The oldest fossils are found in the middle rock layers.
cohesion
Attraction between molecules of the same substance
Attraction between different substances
Repulsion between molecules of the same substance
A type of chemical bond
Law of conservation of mass
matter is created and destroyed in chemical reactions
matter is not created or destroyed, only rearranged
mass can be lost during a chemical reaction
mass is only conserved in physical changes
trough
Highest point of a wave
Lowest point of a wave
Midpoint of a wave
Wave frequency
compound
a pure substance made by chemically combining two or more elements; represented by a chemical formula
a mixture of two or more substances that retain their individual properties
a substance that cannot be broken down into simpler substances by chemical means
a solid formed from the cooling of a liquid solution
Unbalanced Forces
equal forces acting on an object that do not change its motion
unequal forces acting on an object that may result in a change in position, direction, or motion
forces that always result in a net force of zero
forces that act in the same direction and cancel each other out
element
a pure substance composed of the same type of atom throughout
a mixture of different types of atoms
a compound formed by chemical reactions
a solution of various substances in a solvent
coefficient
A number in front of a chemical formula in an equation that indicates how many molecules
A type of chemical bond between atoms
A measure of the concentration of a solution
A unit of measurement for temperature
