Crawford's teacher tells him that all objects exert gravitational forces on one another and these forces depend on the distance between the two objects. Crawford wants to know why, if this is true, he cannot slide the books on his desk toward himself without reaching out and touching them, but the Earth can move objects without making contact in this way. Which statement offers the best explanation for Crawford's question?

When does a spring tide occur? question 9 options: 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. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.