The theory of plate tectonics is about the

The theory gives an explanation to the tectonic plates that form the Earth's surface and to the displacements that are observed between them in their movement on the fluid earth's mantle, their directions and interactions. It also explains the formation of mountain ranges. It also gives a satisfactory explanation of why earthquakes and volcanoes are concentrated in specific regions of the planet (such as the Pacific ring of fire) or why large underwater trenches are next to islands and continents and not in the center of the ocean.

Explanation:

This theory says that for billions of years, the plates of which the continental crust is composed have been experiencing slow but continuous displacement. The movement is due to the continual formation of new material from the mantle. This material is created in the oceanic crust. In this way, the new material exerts a force on the existing material and causes the continents to move.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.