How many ethnic groups are there in the world?
In this case, there are more than 5,000 ethnic groups in the world, according to a 1998 study published in the Scientific American.
What are the 20 ethnic groups in Nigeria?
List of ethnic groups in Nigeria
- Hausa (30%)
- Yoruba (15.5%)
- fulani (6%)
- igbo (15.2%)
- Ibibio (1.8%)
- Tiv (2.4%)
- Ijaw (1.8%)
- Kanuri (2.4%)
How did oxygen form on Earth?
Oxygen in the form of the oxygen molecule (O2), produced by plants and vital for animals, is abundant in Earth’s atmosphere and oceans. But at some point, Earth underwent what scientists call the Great Oxidation Event or GOE for short, as ocean microbes evolved to produce O2 via photosynthesis.
When did oxygen first appear?
2.32 billion years ago
Where does most of Earth’s oxygen come from?
plankton
What organisms used oxygen first?
And some evidence suggests cyanobacteria, the earliest photosynthetic organisms to release oxygen gas as a waste product—although not use it—may have arisen as early as 3.5 billion years ago.
Who created oxygen?
Joseph Priestley
Who discovered water?
Henry Cavendish
What is the Colour of oxygen?
We’re observers, however, so the real trick is how oxygen gets us to pretty colors. (Actually, though it’s a colorless gas, oxygen liquefies into an attractive blue fluid.) In its gaseous form, oxygen usually doesn’t glow.
Can Oxygen change color?
When exposed to oxygen, it turns blue, deepening in intensity with increased ingress. The rate of the color change is proportional to the rate of oxygen entering the package and can be correlated to conventional oxygen transmission rates.
What color is oxygen in models?
red
What color is Liquid Oxygen?
blue
What Colour is silicon?
Pure silicon is a hard, dark gray solid with a metallic lustre and with a octahedral crystalline structure the same as that of the diamond form of carbon, to which silicon shows many chemical and physical similarities.
Is carbon shiny or dull?
Oxygen, carbon, sulfur and chlorine are examples of non-metal elements. Non-metals have properties in common. They are: poor conductors of heat and electricity (they are insulators )…Diamond and graphite.
| Diamond | Graphite |
|---|---|
| Transparent and colourless | Opaque and black |
| Hard | Soft |