Distant sources - A tsunami caused by a very large earthquake elsewhere on the Pacific Rim could reach the California coast many (4 to 15) hours after the earthquake. The Alaska-Aleutians Subduction Zone is an example of a distant source that has caused destructive tsunamis in California.
Norplant and Implanon. Norplant is the name given to a series of rods or capsules that a doctor surgically inserts into a womanâs upper arm. The inserts release progestin into a womanâs bloodstream in order to prevent the ovaries from releasing eggs. However, this mechanism only works some of the time.[1].
Lessina (ethinyl estradiol and levonorgestrel) prevents pregnancy by utilizing a combination of the female hormones estrogen and progestin. First, the hormones prevent ovulation (the release of an egg from one of the ovaries).