Topic content:
According to the theory of plate tectonics, ()
A. Oceans and rifts are often formed in plate tension and fracture areas
B. There are high mountains on the edge of the land plate
C. Each plate includes both continents and oceans
D. Volcanic earthquakes in the plate
Best answer:
According to the theory of plate movement, the surface of the earth composed of rocks is not a whole, but a combination of plates. The major plates are in constant motion. When the adjacent two plates undergo tension and split movement, the distance between the plates will expand, forming oceans and rift valleys, such as the formation of the Great Rift Valley in East Africa. Therefore, options B, C, D do not conform to the meaning of the question, and option A conforms to the meaning of the question
Therefore: A
Answer analysis:
There is no explanation for this question
Test core:
Plate drift theory: a theory that explains the crustal movement and the distribution and evolution of land and sea. The large-scale horizontal movement between continents and between continents and ocean basins is called continental drift. According to the theory of continental drift, all continents on the earth were once unified huge landmasses before the Mesozoic era, called Pangaea or United Ancient Land. From the beginning of the Mesozoic era, Pangaea split and drifted, gradually reaching the current position. Land reclamation: Land reclamation refers to the transformation of the original sea area, lake area or river bank into land. For coastal cities with more mountains and less flat land, land reclamation is an effective way to create flat land for urban development. Many large coastal cities, such as Tokyo, Hong Kong, Macao and Shenzhen, use this method to make flat land. Volcanic seismic zone: There are two major seismic zones around the world: the Pacific Rim seismic zone and the Mediterranean Himalayan seismic zone. The former concentrates more than 80% of the shallow earthquakes (0-70km), almost all of the medium earthquakes (70-300km) and deep earthquakes (300-700km) in the world. It is distributed around the Pacific Ocean, starting from the southern end of South America, extending northward along the west coast to Alaska in North America, and turning westward through Aleutian Islands, Kamchatka Peninsula, Kuril Islands to Japan.