GnRH stimulates the pituitary gland to produce follicle stimulating hormone (FSH), the hormone responsible for starting follicle (egg) development and causing the level of estrogen, the primary female hormone, to rise.
The Great Alaska Earthquake lasted for nearly five minutes and registered a magnitude of 9.2, still the largest ever recorded in North America and second only to the 9.5-magnitude quake that struck Chile in 1960.
Alaska was granted statehood on January 3, 1959. In 1964, the massive  Good Friday earthquake  killed 131 people and leveled several villages. The 1968 discovery of oil at Prudhoe Bay and the 1977 completion of the Trans-Alaska Pipeline led to an oil boom. In 1989, the Exxon Valdez hit a reef in Prince William Sound, spilling between 11 and 34 million US gallons (42,000 and 130,000 mÂ³) of crude oil over 1,100 miles (1,600 km) of coastline.