| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| coal |
a hard black or dark brown substance that is found in the earth. People burn coal for heat and energy. |
| forest |
a large area of land covered with many trees and other plants. |
| forward |
toward a place or time that is further on or in the future; ahead. |
| friendly |
pleasant toward others. |
| gap |
a space or opening between two things. |
| later |
at some following time or future time. |
| lose |
to no longer have something because you do not know where it is. |
| mineral |
a pure, hard substance in the earth that does not come from an animal or a plant. |
| road |
a long, hard surface for vehicles and people to travel on. |
| shower |
a period of rain that lasts a short time. |
| textbook |
a book used for teaching a particular subject. |
| train |
a group of railroad cars connected together that carry people or things from one place to another. |
| trouble |
serious difficulty. |
| tune |
the notes that make up a piece of music. |