These are five questions and five answers:
1) Question 16.
In one year, Earth completes 365 revolutons.
Answer: TRUE.
Step-by-step explanation:
A revolution or spin is a complete turn around its own axis. Every day the Earth make a full revolution. This is the rotation motion of the Earth and the responsible for days and night.
One full rotation of the Earth takes 24 hours, that is why our days last 24 hours.
And as you know there are 365 days in a year. That is because the Earth rotates 365 times in one year.
2) Question 17.
Earth has seasons because its axis is tilted as it revolves around the sun.
Answer: TRUE.
Step-by-step explanation:
Earth's rotation axis is leaned about 23.4°.
This leaning causes that when Sun shines directly over the Northern hemisphere the of Earth, it shines indirectly over the Southern hemisphere. In this time it is summer in North and winter in South.
Six months later, due to Earth translation, the Sun shines indirectly over the Northern hemisphere (it is winter) and shines directrly over the Southern hemisphere (it is summer).
So, it is the the tilt of the rotation axis what causes the seasons.
3) Question 18.
A solar eclipse occurs during a full moon when Earth is directly between the monn and the sun.
Answer: FALSE
Step-by-step explanation:
Solar eclipse is not when Earth is directly between the Moon and the Sun.
The full moon indeed is when Earth is between the Sun and the Moon; then the lunar hemisphere facing Earth is completely sunlit and appears as a circular disk, while the far side is dark. The full moon occurs once roughly every 28 days. But the Sun is not eclipsed every 28 days.
4) Question 19.
When the moon is in Earth's umbra, you see a total lunar eclipse
Answer: TRUE
Step-by-step explanation:
When the moon is entirely in the shadow it does not receive the Sun rays (the Earth block the Sun rays) so the moon does not bright and that is why the Moon is eclipsed.
During a total lunar eclipse, the entire Moon enters the Earth's umbra. A partial lunar eclipse occurs when the umbra covers only part of the Moon's surface.
5) Question 20.
The strength of gravity depends on the masses of the objects and the distance between them.
Answer: TRUE
Step-by-step explanation:
It was Sir Isaac Newton who discoverd that the gravitational force (attraction due to masses of objects) is directly proportion to the product of the masses and inversely related to the square of the distance that separete them.
That is the Universal Law of Gravitation.
The equation of this universal law discovered by Isaac Newton is:
F = G * m1 * m2 / (distance)^2.