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what is the closest star to earth?
the sun
what do bees collect from flowers to make honey?
nectar
does sound travel faster in water or in thin air
in water
what process do plants use to make their own food using sunlight?
photosynthesis
what is the freezing point of water in celsius?
what pigment gives leaves their green color?
chlorophyll
what gas is earth's atmosphere mostly made of?
nitrogen
what is the center of an atom called?
nucleus
what is the powerhouse of the cell?
mitochondria
which layer of the earth is the thinnest?
crust
what chemical element has the symbol 'H'
hydrogen
what type of rock is formed by the cooling and solidification of magma or lava?
igenous rock
what type of energy is stored in an object due to its position?
potential energy
which human body system is responsible for breaking down food?
digestive system
on the pH scale, is a substance with a pH of 3 considered an acid or a base?
an acid
who formulated the 3 laws of motion?
sir isaac newton
what is the largest organ of the human body?
skin
what are the 3 types of tectonic plate activities?
divergent, convergent, and transform
what is the name of the thing that carries genetic information in living organisms?
DNA
what is the only bird that can fly backwards?
hummingbird
what is the hardest natural substance on earth?
diamonds
what is the name of the force that slows down a rolling ball?
friction
how many bones does an adult human body have?
206 bones
mercury, venus, earth, mars, Jupiter, saturn, uranus, neptune
what type of energy is stored in a battery?
chemical energy