"a scratch mark appears on talc when diamond is rubbed on it." what does this statement most likely represent? a. an experiment b. a hypothesis c. a conclusion d. an observation

option d. an observation

Explanation:

"A scratch mark appears on talc when diamond is rubbed on it"; is most likely to be an observation.

A hypothesis is a statement which can be tested through an experiment. An experiment involves some steps. Within an experiment certain observations are made and thereafter conclusion is drawn.

When diamond is rubbed on the talc, scratch mark appears is most likely an observation. The appearance of scratch mark is an observation after talc was rubbed by diamond.

d. an observation

Explanation:

In an experimentation process an observation is a process of examining or monitoring something like a experimental variable or any other entity so as to derive a conclusion of the experiment. It involves the physical or visual examination.

According to the given situation the scratch marks can be observed over the talc caused by the diamond on rubbing. Hence, it is the example of an observation.  

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me