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how many total jet streams are there on earth?
a. one
b. two
c. three
d. four

There are FOUR jet streams on Earth in total.

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

Answer any resource, such as wood or solar energy, that can or will be replenished naturally in the course of time;