a device that moves liquids or gases from one place to another
pump
a relationship between two numbers showing how many times one value is in relation to another
ratio
relating to the body
physical
a liquid that we drink and need to survive
water
being male or female
gender
slightly cold, in a way that is uncomfortable
chilly
below the surface of the ground
underground
no longer existing; all have died out
extinct
an underground train system in a city
subway
long-term changes in the Earth’s weather patterns
climate change
a warm piece of clothing worn over the upper body
a sweater
a person traveling in a vehicle but not driving it
passenger
a large vehicle that carries passengers along fixed routes
bus
the process of allowing fresh air into a space
ventilation
reptiles with a hard shell that live on land or in water
turtles
a small amount, usually just enough to fit in your hand
handful
to break out of an egg when being born
hatch