What is a simulator?why are simulators helpful to scientist?

A simulator is a device that enables the operator to reproduce or represent under test conditions phenomena likely to occur in actual performance.

Simulators are helpful to scientists because experiments and simulations are a way scientists do their work. Using instructional simulations gives scientists concrete formats of what it means to think like a professional and do scientific work. the relationships among variables in a model or models. Simulation allows scientists to change parameter values and see what happens.

Explanation:

depends if you are a hoarder or not

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.