In Science / Junior High School | 2024-09-06

Directions: Read the three plate boundaries description and characteristics. Understand what you are reading. Plate boundaries are the lines at the edges of the different pieces of the lithosphere. Lithospheric plates are moving due to the convection current in the Earth’s interior. The lithosphere is made up of the crust and upper part of the mantle. There are two types of crusts: the continental crust which is thicker but less dense, and the oceanic crust, which is thinner and denser. According to the Plate Tectonic Theory, the Earth’s lithosphere consists of the crust and upper mantle that move slowly and constantly over time. This movement causes the formation of plate boundaries namely: divergent, convergent, and transform fault boundaries. (a) Divergent boundaries refer to plates that separate and move apart in opposite directions forming new lithosphere - the young seafloor. This either occurs at mid-ocean ridges (seafloor spreading) or at rifted continental margins (rift valley). (b) Convergent boundaries are formed when two plates move toward each other. The oceanic plate bends downward at the subduction zone. This occurs in two oceanic plates: convergent boundary and continental plate- oceanic plate convergent boundary. Oceanic plate sinks because it is denser than the continental plate. In the case of convergence of two oceanic plates, the older plate sinks. Whereas in the convergence of two continental plates, they collide and buckle up forming mountain ranges. No subduction occurs in this type of convergence. (c) Transform fault boundaries are plates sliding past or slipping past each other. Directions: Choose your answer from the given choices. Write your answer on a separate sheet of paper. Q1. What does plate boundary show the sliding of two plates? A. Divergent B. Convergent C. Transform-fault Q2. What does plate boundary show the moving apart of two plates? A. Divergent B. Convergent C. Transform-fault​

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