Very hot magma rises toward the surface because it is less dense. The magma becomes
as it cools, and
back toward the
core

form in the mantle where hot magma keeps rising.
then cools and sinks again

The movement of magma under the crust applies
plates
to tectonic plates

Rising hot magma pushes up on the crust, causing it to break and allowing
to form
happens where magma moving sideways and lava
forming new crust pushes plates in opposite directions.

Oceanic trenches form where denser oceanic crust is pushed under lighter
crust. The subducted plate begins to melt as it moves
into the mantie

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days, followed by 7 days when no hormones are ingested. which of the following statements most accurately describes the effects of birth-control pills? -birth-control pills maintain constant levels of estrogens and/or progesterone so there is no surge in lh and ovulation does not occur.-birth-control pills inhibit the development of the uterine lining so implantation of a fertilized oocyte cannot occur.-birth-control pills maintain constant levels of estrogens and/or progesterones and mask the release of the oocyte from the follicle.-the 7 days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant.