The people will have journeyed to the center of the earth. I think this because it is the title. This is fantasy because the center of the earth is too hot to travel to. The people will probably get burnt next.
Plastic, oils from boats, air pollutants.
You need a period after the first sentence. You also need an exclamation mark after Ahoy.
Thesis is basically just a statement or it could be a theory which is an educated guess that is waiting to be proven
She wishes to lead a saintly life where shes still alive...