Rocks may form chemically when ?
plants and animals form calcium carbonate shells or structures.
minerals fall out of solution.
volcanoes erupt.
new rock layers split forming new rocks.
2007-06-09 06:35:52 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
Rocks are formed chemically when minerals fall out of solution, these chemical precipitates are sedimentary rocks called evaporites. A good example of an evaporite is halite (salt) which forms from evaporation of seawater in shallow seas and lakes.
The first choice is also sedimentary but is a clastic sedimentary rock
Volcanoes erupting produce igneous rocks
And the last one doesn't even sound like it changes the rock, except maybe by faulting.
2007-06-09 06:56:46 · answer #1 · answered by Anonymous · 0⤊ 0⤋
plants and animals form calcium carbonate shells or structures. =MAYBE - are they making the calcium carbonate, or just getting it and using it from the environment?
minerals fall out of solution. =NO. Same minerals, just in different form.
volcanoes erupt. =MAYBE - different minerals are formed basesd on temperature, cooling, and other factors, but I don't know if different minerals are formed by some sort of reaction.
new rock layers split forming new rocks. = NO. same rocks and minerals, just different sizes.
2007-06-09 06:43:52 · answer #2 · answered by mikecraig11 4 · 0⤊ 0⤋
Volcanoes erupt, that is a chemical reaction called Igneous rock formation, the first. The last would be Metamorphic the first and 2nd would also be igneous. There are no Sedimentary.
2007-06-09 06:45:46 · answer #3 · answered by Golden Ivy 7 · 0⤊ 2⤋
Yet another homework question...
The first two possibilities are best.
You should really consider doing the studying yourself, instead of looking for the easy way out, you will be a better person for it.
2007-06-09 06:39:44 · answer #4 · answered by minefinder 7 · 1⤊ 1⤋