When a satellite revolves around the Earth at the same rate as Earth rotates it's called ...

• Geosynchronous Orbit

• Stationary Orbit

• Geoplastic Orbit

• Elliptical Orbit

What about the Hoover dam makes it able to hold back huge pressure ?

• Its location

• Its height
• Build with rebar reinforcement

• Its arched shape

What is the name of the lake created by the Hoover Dam ?

• Lake Michigan

• Lake Tahoe
• Lake Mead

• Lake Erie

The Hoover Dam irrigates over _________________ of land.

• 2 million acres
• 1 million acres
• 500,000 acres
• 3 million acres

The Hoover Dam blocks the flow of what river ?

• Mississippi River
• Ohio River

• Missouri River

• Colorado River

What percent of a rocket's weight is fuel ?

• 50%
• 75%
• 90%
• 95%

Rocket's have to include ________ in order to burn their fuel in space.

• Oxygen
• Nitrogen
• Hydrogen
• Helium

Why do rockets no longer have to include fins ?

• Because modern rockets can swivel the thrust nozzle

• Because fins add unnecessary weight to the rocket
• Because rockets are now designed to fly in space where fins are not useful
• Because fins are now considered outdated technology

What is the boiling point of Helium in Celsius ?

• 212 degrees Celsius

• 100 degrees Celsius
• 0 degrees Celsius
• -269 degrees Celsius

What is a superconductor ?

• A material that can conduct electricity without resistance
• A superhero in a comic book
• A type of computer processor
• A high-speed train