Level 8 Level 10
Level 9

Unit 9


18 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Ignore?
build
to construct or make something
model
something that a copy can be based on because it is an extremely good example of its type
prototype
the first example of something
research
a search for knowledge
solution
a method for solving a problem
breakthrough
an important discovery or event that helps to improve a situation or provide an answer to a problem
deadline
a time or day by which something must be done
solve
to find an answer to a problem
test
to do something in order to discover if something is safe, works correctly
theory
a formal set of ideas that is intended to explain why something happens or exists
asteroid
one of many large rocks that circle the sun
collide
to crash together with violent impact
deflect
turn aside; turn away from a straight course
extinction
complete disappearance;the end of existence
hazardous
dangerous
probe
a spacecraft without people, sent into space to collect information
meteor
a space rock that hits the atmosphere of the Earth
meteorite
a rock that falls to earth after a brilliant meteor has passed through the earth's atmosphere