Waltemath described one of the proposed moons as being 1,030,000 km (640,000 mi) from Earth, with a diameter of 700 km (430 mi), a 119-day orbital period, and a 177-day synodic period.
A subduction zone is formed at a convergent plate boundary when one or both of the tectonic plates is composed of oceanic crust. The denser plate, made of oceanic crust, is subducted underneath the less dense plate, which can be either continental or oceanic crust.s a result of pressure, friction, and plate material melting in the mantle, earthquakes and volcanoes are common near convergent boundaries. When two plates move towards one another, they form either a subduction zone or a continental collision. This depends on the nature of the plates involved.
Plates move together at convergent plate boundaries and lithosphere is destroyed. There is a compressional stress on the undeformed rocks which causes the crust to shorten. Re â¦ verse faults (the hanging wall moves up) occur at convergent plate boundaries. Different types of convergent plate boundaries include: oceanic-oceanic, oceanic-continental, continental-continental. In oceanic-oceanic an oceanic trench forms because the oceanic crusts subducts. The oceanic crust, because of its higher density, also subducts in oceanic-continental convergent plate boundaries, which are the most common. In the last case, continental-continental- two continents collide.