Ero/Dep review 1
Q. Which rock layer is most resistant to weathering?
Igneous rocks
Table of Contents
- Q. Which rock layer is most resistant to weathering?
- Q. Which layer of a soil profile would be affected the most by weathering and erosion?
- Q. Which factor had the least effect on the weathering of a rock?
- Q. Which mineral would most likely become rounded at the fastest rate when stumble along?
- Q. Which mineral is hard enough to scratch calcite?
- Q. Which of the following minerals is the hardest?
- Q. What’s rarer than a diamond?
- Q. What is the rarest gemstone 2020?
- Q. What is the rarest gemstone color?
- Q. What is the rarest opal color?
- Q. How can you tell a fake Opal?
- Q. What is the highest quality Opal?
- Q. Is Opal worth more than diamond?
Q. Which layer of a soil profile would be affected the most by weathering and erosion?
Also known as “topsoil” Darkest layer of soil. Contains more humus and smaller rock and mineral particles than the other horizons. Is the most evolved layer of soil and therefore has changed most from weathered rock.
| Question | Answer |
|---|---|
| Which rock weathers most rapidly when exposed to acid rain (calcite) | limestone |
| Which change in climate would most likely cause the greatest increase in chemical weathering of local bedrock? | more rain |
| Which factor has the most influence on the development of soil? | climate |
Q. Which factor had the least effect on the weathering of a rock?
A cold, dry climate will produce the lowest rate of weathering. A warm, wet climate will produce the highest rate of weathering.
Q. Which mineral would most likely become rounded at the fastest rate when stumble along?
Right answer: Selenite gypsum.
Q. Which mineral is hard enough to scratch calcite?
For instance quartz will be able to scratch calcite with much greater ease than you can scratch calcite with fluorite. One must also use enough force to create the scratch (if you don’t use enough force even diamond will not be able to scratch quartz – this is an area where practice is important).
Q. Which of the following minerals is the hardest?
Diamond is the hardest known mineral, Mohs’ 10.
Q. What’s rarer than a diamond?
In fact, high-quality emeralds, rubies, and sapphires are all rarer in nature than diamonds. However, nearly colorless diamonds can top prices of $10,000 per carat because demand for them has been carefully cultivated and supply is tightly controlled.
Q. What is the rarest gemstone 2020?
A List of the Most Rare Gemstones in The World (UPDATED 2020)
- Red Beryl.
- Jadeite.
- Black Opal.
- Taaffeite.
- Alexandrite.
- Painite. The Guinness Book of World Record called Painite the world’s rarest mineral.
- Emerald. A rare variety of the mineral beryl, Emerald is associated with royalty.
- Ruby. Ruby is a pink to red variety of the corundum mineral.
Q. What is the rarest gemstone color?
Red
Q. What is the rarest opal color?
Black opal
Q. How can you tell a fake Opal?
Synthetic Opal, Doublets & Triplets
- Does the stone have a white body tone, or is it transparent?
- Look at the side of the opal – if it has distinct visible ‘layers’, it may be a doublet or triplet (i.e. not a solid opal) In this case, one of the layers will be a thin slice of opal, attached to the dark backing.
Q. What is the highest quality Opal?
BODY TONE
- Black opals are generally the most valuable and have a body tone of N1 to N4.
- Opals with N5 to N6 considered a semi black or dark opal.
- Body tone N7 to N9 are called crystal opals.
Q. Is Opal worth more than diamond?
The value and rarity of a gemstone directly relate to supply and demand. Both diamonds and opals are common, but that isn’t to say that all diamonds and opals are created equal. Because the value of most diamonds will be higher than opals, while high-quality opals are rarer than diamonds.
