What are those white cloud streaks in the sky above??

I live in FL and every once in a while I see a white cloud streak in the sky. I have always thought it was a jet fighter breaking into M1. I also thought it was a rocket launched by Kennedy Space Center until I saw two streaks recently side by side. Does anyone know what this is.. Just curious.What are those white cloud streaks in the sky above??
A single thin white streak is the condensed vapour trail of a jet or a rocket but groups of streaks, slightly broad and long are Cirrus clouds, the highest of all.What are those white cloud streaks in the sky above??
They are contrails. They are formed when water vapor coalesces around carbonaceous particles left in the uper atmosphere by aircraft exhaust. They form much the way clouds do.What are those white cloud streaks in the sky above??
Some would say that the government is spraying chemicals

into the atmosphere.

Sometimes you will see that the vapor trails make X mark up

in the sky, that means that is their target area...