| 1 |
Ice floats on the surface of water due to. |
- A. Higher density
- B. Lower density
- C. Normal density
- D. Very High density
|
| 2 |
Oxygen and nitrogen react to form. |
- A. Nitric Acid
- B. Nitrogen oxide
- C. Nitrogen peroxide
- D. Nitrate
|
| 3 |
Teh process of converting atompspheric nitrogen to useable from is called. |
- A. Nitrogen cycle.
- B. Carbon cycle
- C. Nitrogen fixation
- D. Water cycle
|
| 4 |
The process which loops the amount of nitrogen constant in air is |
- A. nitrogen fixation
- B. nitrogen cycle
- C. oxidation
- D. photosynthesis
|
| 5 |
The process which increases the temperature in the temperatureis called |
- A. Photosynthesis
- B. Oxidation
- C. Greenhouse effect
- D. Evaporation
|
| 6 |
The form of carbon which is not crystalline is. |
- A. Charcoal
- B. Graphite
- C. Bucky Ball
- D. Diamond
|
| 7 |
The amout of carbon dioxide int eh air is increased by. |
- A. Photosynthesis
- B. Respiration
- C. Burning
- D. Evaporation
|
| 8 |
The sun almost entirely consists to the element |
- A. oxygen
- B. iron
- C. phosphorus
- D. hydrogen
|
| 9 |
The percentage of Neon by volume is. |
- A. 0.002
- B. 0.9
- C. 0.02
- D. 0.00055
|
| 10 |
If a key is stiff in a lock, rub the end of the key a soft pencil, which types of elements we obtain. |
- A. Graphite
- B. Silver
- C. Gold
- D. Paltinum
|