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