You are in a hot air balloon, 650 m above the flat texas plains. the earth's radius is about 6400 km. you look out toward the horizon. how far out can you see−that is, how far is your horizon?

91 km

Explanation:

Draw a picture.  The line of sight to the horizon forms a tangent line with the curvature of the Earth.  The radius line to that point forms a right angle with the tangent line.  So we can use Pythagorean theorem to find the distance.

c² = a² + b²

(6400 km + 0.650 km)² = (6400 km)² + d²

d ≈ 91 km

electrical power

here are some information of the future of geothermal energy:

-the future of geothermal energy can pretty much be summed up with a single word: more

-scientists plan in going deeper than 120 meters

-we are hoping that one day, we will get all of our energy from renewable energy sources such as geothermal energy

hope this !