Earth is the third closest planet to the Sun in the Solar system. It’s the only planet whose English names, the world or the Earth, don’t come from Roman or Greek mythology but from Old English and Germanic. It is also referred to as the  Blue Planet, or the Blue Marble because it’s the only planet that has water in liquid from on the surface. In fact, seventy – one percent of Earth’s surface is covered with water, which is vital for all known forms of life. Earth is the only planet that is capable of hosting any known form life. It is home to millions of species of plants and animals, including a global population of humans. Life on Earth is supported and nourished by its biosphere and minerals. Scientists are looking for other planets to accommodate our increasing population. They believe that if humans could trace water on Mars and plant trees, they could increase the amount of oxygen on the planet. That would greatly increase the chance of humans being able to live on it in the future. 
1. Is Earth the third – closest planet to the Moon or the Sun?
    
2.. Is Earth the only planet that has been known to host life?
    
3. Who are looking for other planets to accommodate our increasing population?