濮阳东方医院男科治早泄口碑好价格低(濮阳东方妇科医院技术可靠) (今日更新中)

When the lithosphere is subject to a horizontal extensional force it will stretch, becoming thinner. Eventually, it will rupture, leading to the formation of a rift valley.This process is accompanied by surface manifestations along the rift valley in the form of volcanism and seismic activity. Rifts are the initial stage of a continental break-up and, if successful, can lead to the formation of a new ocean basin.An example of a place on Earth where this has happened is the South Atlantic ocean, which resulted from the break up of South America and Africa around 138m years ago -- ever noticed how their coastlines match like pieces of the same puzzle?Continental rifting requires the existence of extensional forces great enough to break the lithosphere. The East African Rift is described as an active type of rift, in which the source of these stresses lies in the circulation of the underlying mantle. Beneath this rift, the rise of a large mantle plume is doming the lithosphere upwards, causing it to weaken as a result of the increase in temperature, undergo stretching and breaking by faulting.Evidence for the existence of this hotter-than-normal mantle plume has been found in geophysical data and is often referred to as the "African Superswell."This superplume is not only a widely accepted source of the pull-apart forces that are resulting in the formation of the rift valley but has also been used to explain the anomalously high topography of the Southern and Eastern African Plateaus. 1506

Witnesses also described seeing a second gunshot victim, but that person was gone by the time officers and paramedics arrived, Buttle said. 139

Witnesses described the surreal scene after the plane left the airport. John Waldron was walking along a trail near the bay when he noticed the two military jets following a plane doing aerobatics."I thought they were practicing for an air show," he said.After the plane approached Ketron Island, Waldron saw a thick column of smoke followed by a loud explosion, he said."Everyone was literally frozen in place, muttering about what possibly happened," he said.Kathleen Reichel said she watched the planes pass by for about two minutes."My husband and I are recently former Boeing employees, and we were wondering why a jet was near the passenger airplane," she said. "We heard the jet because our windows were down while we were waiting in the ferry line to go to Anderson Island, which is adjacent to Ketron Island." 818

While in the nation’s capital, the veterans will take part in numerous events that honor them for their service, including a Veteran’s Welcome dinner on Friday evening. 168

When the special counsel's office became aware of them, it alerted the FBI, says spokesman Peter Carr. https://t.co/zdcKW7PyOG— NPR (@NPR) October 30, 2018 155

来源：资阳报