D. He was laughed at, at first
Your answer will be 4, our magnetic field.
Earth itself is largely protected from the solar wind by its magnetic field. However, some of the charged particles are trapped in the Van Allen radiation belt.
Hope this helps, have a great day! :)
Hi there!
To define gravity in a way you can understand, gravity means the force of something acting upon something else to bring it down back to the ground.
For example, gravity is what pulls us to the ground when we jump in the air. You can't just jump in the air and stay in place, right?
Another good example is if there was a spaceship directly in between the Earth and the Moon, it would very very very slowly go toward the earth because of its gravitational pull on the spaceship.
Hope this helps! :D
Remember, just message me if you need anymore help on anything!
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