VOCABULARY EXPEDITION 3 LESSON 1• ancient

• The walls of the ancient building were crumbling and in ruins.• very old; from the distant past

• develop• Inventors develop new sneaker materials that make shoes lighter and more

comfortable.• to bring into being

• position• Ruth was careful to position the pizza in the middle of the table so that

everyone could reach it.• the place where something is

• astronauts• The astronauts looked out of the spacecraft window and saw the small, blue

Earth far below.• someone trained to travel and work in space

• astronomy• Nikko took a course in astronomy, because he was interested in learning about

the planets and stars.• the scientific study of stars

VOCABULARY EXPEDITION 3 LESSON 3

• surface• The surface of a tennis ball is fuzzy.

• the outside part of something

• vast• The Pacific Ocean is vast.

• very, very large

• unit• An inch is a unit of measurement.

• a standard amount by which things are measure

• orbit• The moon follows an orbit around the Earth.

• the path one object takes as it moves around another

• organized• The clothes in a local store display are organized by color.

• grouped together

VOCABULARY EXPEDITION 3 LESSON 6• exist

• When we read nonfiction, we read about things that exist, such as real people and things.• to be alive or real

• direct• The family took a direct route to the campground, without any of the usual

side trips.• simple and straightforward

• intelligence• The apes showed a sign of intelligence when they used a stick as a tool to

get food.• the ability to learn skills and facts, and to apply them in some way

•watery• The visitors felt uncomfortable because they were not used to the humid, watery swamp.• having the quality of water

• bacteria• To avoid spreading bacteria, always cover your mouth when you cough.

• a very small life form; germ

VOCABULARY EXPEDITION 3 LESSON 8

•artificial• The artificial flowers were made of silk and plastic.

• made by humans

• communication• The communication tools we use today connect people more

quickly than did older methods, such as letter writing.• having to do with sending or exchanging information

• system• A system of computers and satellites is used to predict the

weather .• a set of things acting together

•accurate• The forecast of rain proved to be accurate when the

thunderstorm struck the city.• correct