| earth(expression, geology, science, planet) |
| natural science(noun, expression, form, study, science) |
| physical science(noun, expression, form, study, science) |
| study of matter and energy(noun, expression, form, study, science) |
| study of phenomena of the physical world(noun, expression, form, study, science) |
| study of the physical world(noun, expression, form, study, science) |
| environmental science(environment, science, classification) |
| science(noun, form, study, field) |
| study(noun, form, science, field) |
| branch of scientific knowledge(noun, expression, study, treatment, science) |
| branch of knowledge(noun, expression, form, study, science) |
| branch of study(noun, expression, study, treatment, science) |
| scientific discipline(noun, expression, study, treatment, science) |
| scientific knowledge(noun, expression, study, treatment, science) |
| field(noun, study, treatment, science, knowledge) |
| knowledge(noun, study, treatment, science) |
| phenomenon(noun, study, treatment, science, knowledge) |