Word Wise Unit 4 Test

A_________________ , which is about 9.54 trillion kilometers, is a unit used to measure how far stars are from the earth.

• isotope
• molecule
• light-year
• oxygen

Humans must breathe the element_________________ , which makes up 21 percent of
the earth's atmosphere.

• oxygen
• phosphorus
• molecule
• static

The Apollo rockets went to the moon for ____________ exploration.

• comet
• ellipse
• lunar
• solstice

The nonmetallic element _____________ is used to make matches.

• molecule
• phosphorus
• oxygen
• isotope

A(n) ___________is an atom that contains the same number of protons but different numbers of neutrons.

• isotope
• comet
• solstice
• molecule

A ________ of water has two hydrogen atoms and one oxygen atom.

• molecule
• solstice
• light-year
• elipse

Bill used his telescope to see the _____________ , a small icy body from the outer solar system, streaking across the sky.

• oxygen 
• lunar
• isotope
• comet

Our school's oval running track is shaped like an _______________      

• ellipse
• solstice
• molecule
• lunar

When a body is not moving, it is ____________________ 

• ellipse
• phosphorus
• lunar
• static

Nitrogen is an element that occurs in all living things.

• True
• False