a large piece of land surrounded by water

(hint: there are seven of them)

the study of Earth and the way people, plants,

and animals live on it and use it

a large, mostly flat land area

that rises sharply above the land around it

pattern of wether that occurs in a place

year after year

a measure of distance on Earth

north or south of the equator

unit used to measure the distance

on Earth's surface

a measure of distance on Earth

east or west of the prime meridian

the grid on a map

made up of lines of latitude and longitude

a period of time when

huge glaciers moved across Ohio

the place where a river empties

into a larger body of water

a smaller river or stream that

flows into another, larger river

any substance, such as a chemical,

that makes the air, water, or soil dirty