EARTH
PLANTS
ANIMALS
LIGHT
SOUND
100
what is the largest layer of the earth?
mantle
100
what is in a plant cell and not in the animal cell?
cell wall and chloroplasts
100
what is an invertebrate?
an animal who has no back bone
100
light is a form of what?
energy
100
what can sound not go through?
vacuum
200
in science terms, how old is the earth?
4.5 billion years old
200
what is a plant that has tissue and a xylem?
vascular plant
200
what are the main five groups of animals?
birds, amphibians, reptiles, fish, and mammals
200
what can light do that sound can't?
go through a vacuum
200
a sound wave is a ___ wave?
compression
300
earth has 8-12 ___ that can be convergent, divergent, and transformed.
plates
300
a plants cell is what shape?
rectangular
300
an animals cell is what shape?
circular
300
which is faster, sound or light?
light
300
frequency is?
the number of times something happens during a period of time
400
the inner most core is solid because ___ and ___ lay on it.
heat and pressure
400
name two types of nonvascular plants.
liverwort and moss
400
animal cells have 4 main organelles. name them
cytoplasm, cell membrane, nucleus, and vacuole
400
what travels faster than light?
nothing
400
sound cannot be made without this?
vibrations
500
the outer core is mainly made out of ___ and ___?
iron and nickel
500
what animal group are we classified in?
mammals
500
light can be formed into _____?
heat
500
sound can be reflected, ___, and ___?
reflected, transmitted, and absorbed
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