It may not be possible to take the class on field trips, but as a teacher I feel that it is my responsibility to bring the location to the classroom for the students. That may be through pictures, newspaper articles, or even trade books. In science as well as in mathematics, I feel that when children use their hands, they learn more. In science, children should be allowed to explore. Giving them worksheets or asking them to read a chapter and answer the questions at the end of it, in my opinion, is not an affective ways to teach science.
Children learn by doing.
Mathematics is also an area where children learn better by using their hands. Manipulatives are great to use in math. I do not feel that they should be something that students must have in order to solve a problem. I feel that all of these techniques, used in conjunction with one another, provide a classroom environment that is inviting for any student and will foster learning in all students.