Answer:
There are 50 states in the United States of America
Answer:
Orbit.
Explanation:
After the discovery of Uranus, scientists were having trouble figuring out the planet's orbit. They realized that there must be another planet farther out than Uranus.
Pacific ocean is called the ring of fire because of a lot of volcanoes and tectonic activities happening there
A system or network that allows trade is called a market. An early form of trade, barter, saw the direct exchange of goods and services for other goods and services. Barter involves trading things without the use of money.
