In this project I learned about how the waves harm the sand and how can we solve it, I leaned about how people use machine and other things to solve the problem, and how it works, also I have a chance to think about what can I do, and how can I make something new to solve the problem.

Question 1- Resources limit human population growth because when essentail resources are in short supply, their prices rise because of the high demand. The high price of living will make it hard to afford a child, so people will stop giving birth, and the population will decrease. Also when the cost of living increases people have to work harder and work more, they don't have enough time to take care of the kid. So they will have to hire a baby sitter which cost more money.

Question 2-Solar eclipse is when the Moon move to the middle of the Sun and the Earth, and when this happens the Moon will temporarily block the light from the sun to the Earth. So that is why we can not see the Sun, but don't worry this only last for about 2-5 hours, and this do not happen mounthly because the Earth tilted about  5 degree angle relative to Earth's orbit around the Sun, because of this the Moon usually passes too high or too low. And the Lunar Eclipse is during the full Moon when the Earth block the Sun's rays casting our shadow onto the Moon.

Question 3-The solar eclipe is my favoite in this unit because I never exprience one before, not even once, and I always love things I never seen before! Also i think it is very interesting that this kind of things can happen when the moon block the sun! Last it is also the easiest one to understand in this unit, others are all pretty complicated.