Science & NCLB in elementary/middle schools

In some states, science and social studies were taught separately but now, they must share their time in order to accommodate more time for mathematics and reading. For instance, in some middle schools that used to offer a full year of science and social studies give a semester of each. This means that the teacher and students do not get much time to be fully engaged with either subject. They only get a slice of the surface in either subject. Also, the teacher would have to be quick in terms of teaching a full year of either science or social studies curriculum. But this could also mean that science instruction would increase from 45 minutes to 60 minutes on a daily basis. Also, if the subject is not taught at an early age, the students would not pick it as an elective in middle and high schools. Elementary teachers feel that they do not have enough time to teach science in a meaningful way.