Answer:
Explanation:
I think none of the above, because when caused by a UV light it damages the cells. And if enough builds up overtime it causes uncontrollable growth and leads to skin cancer.
Hope that helped? It might be another answer honestly.
A-leads to the abrasion of rocks and minerals
A-dense vegetation cover
True
Explanation:
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils.
Agent of weathering are wind, water and glacier.
Chemical weathering contributes to physical weathering in that it leads to the abrasion of rocks and minerals.
During chemical weathering, a rock chemically combines with materials in the environment and weakens it.
When physical weathering processes are induced, grains produced independently weakening of bonds in rocks grind against one another and wears each other off.
An area with a dense vegetation cover undergoes rapid chemical weathering:
- Plant roots penetrates deep into the rock and increases the surface area of chemical action.
- Plants produce chemicals that combines with rocks and causes them to decay.
- Since the area is always moist, chemical action becomes more severe.
Buildings and statues made of stone are subjected to the same degree of weathering as rocks exposed naturally.
This is true.
Statues and buildings weather just like rocks we find in nature.
It is the same sunshine and rain that impacts rocks that also impacts buildings and statues.
So they degrade at the same rate except they are protected.
learn more:
Erosion brainly.com/question/2473244
#learnwithBrainly
Answer:
Carbonation. When you think of carbonation, think carbon
Oxidation. Oxygen causes oxidation.
Hydration. This isn't the hydration used in your body, but it's similar.
Explanation:
68000 = 6.8 * 10000 = 6.8 * 10^4
hope this helps? c;
Step 1 : Write balanced chemical equation.
CaF₂ can be converted to F₂ in 2 steps. The reactions are mentioned below.
I] ![CaF_{2} + H_{2} SO_{4} -------> 2HF + CaSO_{4}](https://tex.z-dn.net/?f=%20CaF_%7B2%7D%20%2B%20H_%7B2%7D%20SO_%7B4%7D%20-------%3E%202HF%20%2B%20CaSO_%7B4%7D%20%20)
II] ![2HF -------> H_{2} + F_{2}](https://tex.z-dn.net/?f=%202HF%20-------%3E%20H_%7B2%7D%20%2B%20F_%7B2%7D%20%20)
The final balanced equation for this reaction can be written as
![CaF_{2} + H_{2} SO_{4} ---------> CaSO_{4} + H_{2} + F_{2}](https://tex.z-dn.net/?f=%20CaF_%7B2%7D%20%2B%20H_%7B2%7D%20SO_%7B4%7D%20---------%3E%20%20CaSO_%7B4%7D%20%2B%20H_%7B2%7D%20%2B%20F_%7B2%7D%20%20)
Step 2: Find moles of CaF₂ Using balanced equation
We have 1.12 mol F₂
The mole ratio of CaF₂ and F₂ is 1:1
![1.12mol F_{2} * \frac{1molCaF_{2}}{1molF_{2}} = 1.12molCaF_{2}](https://tex.z-dn.net/?f=%201.12mol%20F_%7B2%7D%20%2A%20%20%5Cfrac%7B1molCaF_%7B2%7D%7D%7B1molF_%7B2%7D%7D%20%20%20%20%3D%201.12molCaF_%7B2%7D%20%20)
Step 3 : Calculate molar mass of CaF2.
Molar mass of CaF₂ can be calculated by adding atomic masses of Ca and F
Molar mass of CaF₂ = Ca + 2 (F)
Molar mass of CaF₂ = 40.08 + 18.998 = 78.08 g
Step 4 : Find grams of CaF₂
Grams of CaF₂ = ![1.12molCaF_{2} *\frac{78.08gCaF_{2}}{1mol CaF_{2}}](https://tex.z-dn.net/?f=%201.12molCaF_%7B2%7D%20%2A%5Cfrac%7B78.08gCaF_%7B2%7D%7D%7B1mol%20CaF_%7B2%7D%7D%20%20%20%20)
Grams of CaF₂ = 87.45 g
87.45 grams of CaF2 would be needed to produce 1.12 moles of F2.