Answer:
Radio-wave communications signals travel through the air in a straight line, reflect off of clouds or layers of the ionosphere, or are relayed by satellites in space. They are used in standard broadcast radio and television, shortwave radio, navigation and air-traffic control, cellular telephony, and even remote-controlled toys.
Explanation:
Flashing yellow: 'proceed with caution'
usually to mark presense of a firestation nearby
flashing red: 'stop, then proceed'
flashing red is just a stop sign essentially
Answer:
Here are some examples from my school's artists:
Explanation:
Answer:
Segregation in America. Or the reconstruction era after the american civil war
Explanation:
Right after slavery was abolished in 1865(ish) Jim Crow laws, Separate but equal ruling in plessy v. Ferguson
Answer:
Trade brought wealth to a culture in ancient Egypt.
Explanation:
Without the canals and rivers, there would not be any route to trade and water to grow crops for food.
