a group of stars, gas, and dust held together by gravity
What is galaxy
100
An object in the solar system made up of ice, dust, and frozen gases that develops a tail of light when it swings close to the sun and is pushed on by the solar wind.
What is comet
100
When the mood appears to be getting smaller night by night
What is waning
100
The solid area at Earth's Center
What is the inner core
200
A technique that rows patches of skin tissue to replace burnt or damaged skin.
What is tissue engineering
200
The movement of Earth in a regular, curved path around the sun, which takes one year to complete
What is revolution
200
The nine planets and numerous other objects that circle the sun.
What is solar system
200
The point where the waves from an earthquake hit the surface of Earth, directly over the focus
What is epicenter
200
The cycle of movement of magma in the plastic like layer of the mantle, just under Earth's crust.
What is convection current
300
The structure inside of cell nuclei that contains DNA and determines what kids of traits an organism will have
What is chromosome
300
An event that happens when the moon passes between the sun and Earth or Earth passes between the sun and moon, producing a shadow.
What is eclipse
300
The spinning of Earth on its imaginary axis, which occurs once every 24 hours and causes day and night as Earth rotates toward or away from the sun.
What is rotation
300
Theory that the continents move across Earth's surface
What is continental drift
300
A large section of Earth's crust
What is plate
400
Green organelle in a cell that traps energy from sunlight and turn it into food
What is chloroplast
400
a group of stars that forms a pattern in the sky and may be named after a real or imaginary animal, person, or object
What is constellation
400
dense, massive celestial body composed of gas; produces energy and has a life cycle
What is a star
400
The thickest layer of Earth
What is mantle
400
The exact spot inside Earth where an earthquake starts
What is focus
500
Cell membrane
What is the flexible layer that forms the boundary between a cell and its environment
500
Axis
What is the imaginary line that Earth spins around and whose tilt is responsible for Earth's seasons
500
Light years
What is a unit equal to the distance light travels in a year, which is used to measure the distances between galaxies.
500
Waxing
What is when the moon appears to be getting larger night by night
500
Volcano
What is a place in the world where the hot, liquid magma from below the crust breaks through and flows out onto the ground.