Six:
1. Upper Mississippi
2. Arkanas River
3. Illinois River
4. Missouri River
5. Ohio River.
6. Red River
Answer:
Explanation:
Oxygen is of no use to them, so they release it into the air. So there's a simple explanation for the Great Oxidation Event. It was the cyanobacteria, pumping out unwanted oxygen, that transformed Earth's atmosphere.
Answer:
3) Bismarck, North Dakota
Explanation:
The city that has a climate characterized by confidentiality is Bismarck, North Dakota. This city is relatively close to the center of the US, thus it is far away from the large bodies of water. It is in the mid-latitudes, so it doesn't have too much of an influence from the Arctic or from the tropics. Bismarck has just about enough rainfall so that it is not semi-arid, though it is on the borderline. The summers tend to be dry and hot, while the winters tend to be very cold and snowy.
Protons - positively charged (+1)
Neutrons - Neutral charge (0)
Electrons - Negatively charged (-1)
Protons and neutrons stay inside the nucleus, while electrons circle the outside.
Explanation:
Air pressure
Measured using a tool called anemometer which looks like a wind vane.
