ABC BOOK OF SCIENCE

ASTRONOMICAL UNIT

• The distance from the earth to the sun

BUOYANCY

• Upward force exerted on a fluid

CELL

• The smallest unit of life

DENSITY

• The degree of compactness of an object

ELECTRON

• A stable subatomic particle
• Charge of negative electricity

FORCE

• Strength or energy

GALAXY

• Billions of stars
• They're Held together by gravity

HYPOTHESIS

• Propostions that explain something

ISOTOPES

• Varients of a particular chemical element

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KINETIC ENERGY

• The energy of motion
• Where the object is gojng the fastest

LIGHT YEAR

• The distance light travels in one year
• It is 9.5 trillion kilometers

MASS

• How much matter an object is made of

NEUTRON

• Particle that has no electric charge
• Located in an atoms nucleus

ORGANISM

• A individual living thing
• Made up of ore or many cells

PERIODIC TABLE

• A table of elements
• Arranged by the atomic number

QUASAR

• The very bright center of the galaxy

REACTENT

• A substance that is present to the beginning of a chemical reaction
• Changed into a new substance

SOLID

• Matter that has a definite shape and definite volume
• The molecules in a solid are close together

TENSION

• The force that stretches an object
• Also, the force transmitted through a stretched object

UNIVERSE

• Space and all the matter in it

VECTOR

• It has both size and direction

WEIGHT

• The force of gravity on an object

X-RAY

• A form of electromagnetic radiation

YTTRIUM

• Chemical element with symbol Y
• Atomic number 39

ZOOLOGY

• The study of zoo animals