Select three things a USDA Organic Certification indicates. locally grown
all natural food
ecological balance
no genetic engineering
no contamination
no synthetic fertilizers

amber has allowed scientists to study dna that has been preserved over millions of years.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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