What is the role of the helicase enzyme in dna replication? apex?

Look at the picture below . what does this picture represent ?

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary

How do you think earths interior affects what is happening on the surface? 2. how do fossils support the continental drift hypothesis? 3. how does sea- floor spreading support the hypothesis of continental drift? 4.what do scientists observe when they studied the magnetic fields of rocks on the sides of mid-ocean ridges? 5. what is a tectonic plate ? 6. explain mantle convection 7.how can movements of the continents affect earths climate? 8. what occurs during drifting?