Table of Contents
- 1 What type of rock is most resistant to weathering?
- 2 Which rocks are too hard *?
- 3 What is the most resistant rock?
- 4 What rock is most susceptible to chemical weathering?
- 5 What kind of rock is River rock?
- 6 Which rock is the strongest rock?
- 7 How are minerals extracted from underground?
- 8 What are the disadvantages of underground mining?
What type of rock is most resistant to weathering?
Sandstone is a sedimentary rock that is highly resistant to weathering. Other sedimentary rocks you will encounter are mudstone and siltstone.
Which rocks are too hard *?
Answer: Metamorphic rocks tend to be the hardest of the three types of rock, which are igneous, metamorphic, and sedimentary rocks.
What types of rock would be easiest to dig in?
Sedimentary rock is made up of particles or sediments that have been compacted over time. This type of rock is relatively easy to handle as it can be turned back into sediment. Metamorphic rocks are formed through extreme amounts of pressure. For example, marble and slate are part of the metamorphic rock category.
Which of the three types of rocks is the hardest?
Metamorphic rocks
Metamorphic rocks tend to be the hardest of the three types of rock, which are igneous, metamorphic, and sedimentary rocks.
What is the most resistant rock?
Quartz is known to be the most resistant rock- forming mineral during surface weathering. However, a quartzite, a rock containing more than 98\% quartz, is shown to have many weathering features that resemble those in limestones (Wray, 1997).
What rock is most susceptible to chemical weathering?
Not only is quartz the most stable of the common rock forming minerals in chemical weathering, its high hardness and lack of cleavage make it quite resistant to mechanical weathering. Quartz is itself an agent of mechanical weathering in the form of blowing dessert sand.
What is the softest rock?
talc
The name for talc, a sheer white mineral, is derived from the Greek word talq, which means “pure.” It is the softest rock on earth.
What are three rocks?
There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers.
What kind of rock is River rock?
River rocks can be sedimentary, igneous, or metamorphic depending on the particular geography of the river where the rocks were found. A river that flows through a volcanic area is sure to have igneous rocks, for example.
Which rock is the strongest rock?
The strongest rock in the world is diabase, followed closely by other fine-grained igneous rocks and quartzite. Diabase is strongest in compression, tension, and shear stress. If mineral hardness is the determining factor of strength then diamond is technically the strongest rock in the world.
Which rock type is most difficult to identify?
All rocks start out as igneous or sedimentary rocks – any and everything that can happen to those will make a metamorphic rock – so that category is the most diverse and difficult to identify.
How do we determine whether a rock is economically viable to mine?
We must determine whether these concentrations are economically viable to mine. Rocks with large concentrations of minerals, are called ores. Mining depends on finding good quality ore, preferably within a small area. The next step is to get the rocks which contain the mineral out of the ground.
How are minerals extracted from underground?
Where ever minerals occur deep below the earths crest or the overburden is too thick or the mineral occurs as strands in hard rock, Underground mining methods are employed to extract the valuable mineral deposits.
What are the disadvantages of underground mining?
Underground mining has the potential for tunnel collapses and land subsidence (Betournay, 2011). It involves large-scale movements of waste rock and vegetation, similar to open pit mining. Additionally, like most traditional forms of mining, underground mining can release toxic compounds into the air and water.
What type of rock are diamonds mined from?
The diamonds can then be mined in this primary rock emplaced in the crust. These are called primary deposits. Many of these deposits are carrot-like bodies that have cut through older rocks. The carrot-like bodies are referred to as kimberlite pipes, or diatremes .