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Coal is considered to be a rock.
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Is rubidium harder or softer than potassium why?
it is softer
What is harder lignite or anthracite coal?
Anthracite coal is harder than Lignite.
What element is harder than gold but softer than copper?
it is silver
Is francium harder or softer than sodium?
The hardness of francium is not known.
Which is harder silver or gold?
Silver is softer than 18K gold.
Is diamond softer or harder than rock?
Harder..One of the hardest things in the natural world.
How pedestal rock formed?
Pedestal rocks are usually formed in desert, when wind erosion wears away softer rock under-laying a harder rock. The harder rock is eroded at a slower rate than the softer rock.
Is rubidium harder or softer than potassium why?
it is softer
Which is harder obsidian or plain regular rock?
Impossible to say, not knowing the definition of plain regular rock. There are some rocks harder than obsidian, while many are softer.
What is a form of calcium carbonate softer than marble but harder than chalk?
Limestone is softer than marble, but harder than chalk.
Is a No. 1 pencil harder or softer than a No. 2 pencil?
It's softer. #1 softest, #2 slightly harder, #3 harder than #2, etc.Softer.a #1 pencil is softer than a#2 pencil
What is harder lignite or anthracite coal?
Anthracite coal is harder than Lignite.
What is the hardness of the Metamorphic rock?
Depends on which one. Diamond is a metamorphosed coal/carbon that is the hardest natural substance known. Marble is metamorphosed limestone that is much softer. It's safe to say that all metamorphosed rocks are harder than they were in their pre-metamorphosed form.
What is the hardness of a metamorphic rock?
Depends on which one. Diamond is a metamorphosed coal/carbon that is the hardest natural substance known. Marble is metamorphosed limestone that is much softer. It's safe to say that all metamorphosed rocks are harder than they were in their pre-metamorphosed form.
What is the process whereby softer sedimentary rocks erode more quickly than harder rock shaping the surface of the landscape?
Weathering and erosion.
What is softer then enamel but harder than cementum?
DENTIN
What mineral is harder than gypsum but softer than flourite?
calcite
