To be honest, there was not a whole lot of evidence of science in my 1st grade classroom. Since most of the day is spent with an emphasis on language arts and reading, the walls are filled with items relating to that subject, as shown in this picture of the room's math wall.
I asked my CT about science in the classroom, and she explained that they alternate between social studies and science in the first grade curriculum. She provided me with a timeline of what the students would be teaching throughout the year and according to it, their science focus right now is on "Magnificent Magnifiers", in which they learn about magnifying glasses and be able to observe and record changes in size using the magnifiers. Also, included in one of the classroom centers was a "science or social studies center". It currently projects displaying what the children had done over the summer, as well as a little coloring worksheet pertaining to weather, which my CT informed me that they were also learning about. So, when I asked some of the first graders in my class what they thought about science and what science meant to them, most of them all had the same answer: weather!
One thing I did notice in the classroom though was the variety of books available in the classroom's library, many which can easily be related to science. Since the students were on the topic of weather, my CT read a book to the class about the first day of fall, since it was going to fall on the next day. She also showed the students other books about autumn, including this book called Leaf Man by Lois Ehlert in which she constructed all of the book's illustrations with a collage of different types of leaves. This book was read to my class the previous week in the LSE Library, and afterward they were encouraged to go home and make their own "leaf people" out of leaves that they found around their own neighborhoods so that they could be displayed in the library.