The sidereal month is the time the Moon takes to complete one full revolution around the Earth with respect to the background stars. ... Thus, the synodic month, or lunar month, is longer than the sidereal month. A sidereal month lasts 27.322 days, while a synodic month lasts 29.531 days.
As divergence is defined as constructive plate boundary with opening in between the two slabs of tectonic rock being an heavy and oceanic plate the divergence is found mostly in where the new lava flows are being created and the newer rock are thus located near to the surface of the ridges as a result of the upwelling of hot molten lava from the magma chambers below.
Other examples being the mid-Atlantic ridge, red sea ridge, and eastern pacific rise.
And other popular ridges in the world that have lava flowing from the base and thus demarcate the divergent boundaries with continental crustal movement based on some sentiments form below, as slab push and slab pull.
