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].
The hormones in the birth control implant prevent pregnancy in two ways: 1  Progestin thickens the mucus on your cervix, which stops sperm from swimming through to your egg. 2  Progestin can also stop eggs from leaving your ovaries (called ovulation), so there's no egg to fertilize.