A scientist begins working by trying to explain a natural occurence that is... 1. consistent
2. observable
3. In a lab
4. undetectable​

Observable

Explanation:

An observable phenomenon leads to an hypothesis.

2. observable

Explanation:

The scientific method relies on a scientist being able to study an occurrence and understand it. So, all the occurrences must be observable; otherwise, they cannot be studied. If the patterns are observable then one can follow the scientific method and experiment with the different variables. All science depends on the observable world and the people that study it.

the answer is c on e2020, bud.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.