You come across a thick deposit of shale that forms a layer in the ground. what can u infer about the area’s past environment

Shale is defined as a clastic sedimentary rock that is made up of clay particles that are very fine-grained in nature. This Clay results from the breaking down of feldspar minerals.

Shale generally forms in deep marine environment, lagoonal environment, lakes and swampy areas where the amount of water is sufficient for the accumulation of fine clay and silt size particles on the seafloor. These sediments after getting deposited is subjected to compaction and lithification as a result of which shales are formed.

Thus, it can be concluded that the environment of the formation of shales was a deep and shallow marine environment, lagoonal and swampy areas.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

i believe the answer is a.