Wegener hypothesis of continental drift was replaced in 1967 by which theory that

Alfred Wegener hypothesis of continental drift was replaced in 1967 by plate tectonics. Today, the theory of plate tectonics is widely, this theory explains the structure of the earth's crust and many associated phenomena as resulting from interaction of rigid lithospheric plates that move slowly over the underlying mantle.   

The economy of Russia is an upper-middle income mixed and transition economy with enormous natural resources, particularly oil and natural gas. It is the fifth-largest economy in Europe, the world's eleventh-largest economy by nominal GDP and the sixth-largest by PPP. However, it packs a much larger punch in the global stage than it should due to its land mass and formidable military.

Explanation: