Here are the Science Units we will study in 1st grade:

Solids and Liquids
Pebbles, Sand and Silt
Butterflies and Ants

Here is a site for first grade science.
LISD Science Matrix (what we teach)
classroom.leanderisd.org/webs/elemsc/first_grade_science.htm

Here's what the state requires us to teach in first grade Science.
www.tea.state.tx.us/rules/tac/chapter112/ch112a.html#112.3