When does spring tide occur
a. they occur when the sun 45° angles from each other this happens once every spring
b. they occur on the date of the vernal equinox each year no matter what stage this is why they are called spring tides
c. they occur when the sun moon and earth are aligned in spite of their name these tides occur twice a year in the spring and fall .
d. they occur when the sun moon and earth are aligned in spite of their name these tides occur all your long ?

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: