Are these is correct sentences?

Can someone check these sentences for me? Are they is correct?

1. Throughout history there are tales of heroes and the journeys that they embark on.
2. We all know most of novels, movies and stories, the main character goes through a journey.
3. Journey is a stage in which a person takes throughout their entire life or it is known as “The Hero’s Journey”.
4. In a hero's journey, the hero must overcome many trials or events to finish the journey and reach fulfillment.
5. There are eight stages in hero’s journey and multiple of challenge, which become harder as the hero continues in the journey.
6. Most of the hero has to overcome and battle through in order to achieve their goal or reaching their home and love one.
7. In the “Avatar” movie is a true hero’s journey that takes place in the year 2154 on Pandora of the planet Polyphemus in the Alpha Centauri star system.
8. Humans are need a rare mineral in order to solve the ecological crisis on Earth.
9. Pandora is the place where Na’vi lives, a blue-skinned species, who live in harmony with nature, worshiping a mother goddess called Eywa.
10.In Pandora the atmosphere is toxic to humans, they cannot survive so they use breaking mask to exposure to Pandora atmosphere.