The range of the tides is affected by the relative positions of the sun and the moon. during the new moon and full moon, the highest high tides and the lowest low tides occur. during the first and third quarters of the lunar month, the lowest high tides and the highest low tides occur. throughout the month, the tidal range gradually increases and decreases between the minimum and maximum values of the range.
- sketch a graph of a tidal range as a function of time, showing what you think the shape of a tidal cycle might look like for one month. on your graph, indicate where you think

Daily the tides change 4 times a day, so high low high low, you can imagine it as Earth's daily rotation beneath the Moon, but the other side has a same tide since all water wants to be in balance. 

The Moon goes in a month around the Earth, and when she is New or Full (mistake in question!), together with the Sun all three are in one line and results in an extra attraction, which means extra high tides and extra low tides for that day. 

So in your graph you surely have 4 up and downs every day, and let's say halfway the month draw the ups and downs higher and deeper, and again at the end of the month.marlies · 3 years ago