1. How long has gravity been around?
A. When the solar system started.
B. Since the very start of the Universe.
C. When the moon was formed.
D. When the Earth was just rocks.
2. What keeps the atmosphere around planet Earth?
A. The weight of clouds.
B. Gravity of the moon.
C. Gravity of Earth.
D. The force the Sun pushes towards Earth.
My answers are
1. B
2. C
Is this correct?!
I agree.
Thanks
1. The correct answer is B. Since the very start of the Universe.
To determine the answer, we need to understand the concept of gravity and the history of the Universe. Gravity is a fundamental force of nature that affects all objects with mass. It is responsible for the phenomenon of attraction between objects.
According to our current understanding of the universe, gravity has been present since the very start of the Universe. During the Big Bang, which is believed to have occurred approximately 13.8 billion years ago, all matter and energy were concentrated in an extremely dense and hot state. As the Universe began to expand and cool, gravity played a crucial role in the formation of galaxies, stars, and planets.
Option A, "When the solar system started," is not accurate because gravity was already present before the formation of the solar system.
Option C, "When the moon was formed," is not correct either because the formation of the moon occurred as a result of a collision between a Mars-sized object named Theia and early Earth, which happened after the formation of the Universe.
Option D, "When the Earth was just rocks," is not accurate because gravity was present even before the Earth's rocks formed.
2. The correct answer is C. Gravity of Earth.
To determine the answer, we need to understand how the Earth's atmosphere is held in place. The Earth's atmosphere is a layer of gases surrounding the planet. It is essential for supporting life as we know it.
The force that keeps the Earth's atmosphere intact is the gravity of Earth itself. Gravity is what holds all objects with mass onto the surface of the Earth, including the gases in the atmosphere. The gravitational pull of the Earth is strong enough to keep the gases from simply drifting off into space. This is why we do not see the Earth's atmosphere dissipating into the void.
Option A, "The weight of clouds," is not correct because although clouds play a role in the composition of the Earth's atmosphere, they do not directly keep the entire atmosphere in place.
Option B, "Gravity of the moon," is not accurate because the moon's gravitational pull affects ocean tides and other aspects of Earth, but it does not hold the atmosphere in place.
Option D, "The force the Sun pushes towards Earth," is not accurate either. While the Sun's radiation and solar wind can have an effect on the Earth's atmosphere, it is not the primary force responsible for keeping the atmosphere intact.