| unpolluted environment(expression, nature, environment, condition) |
| alter(verb, nature, action, change, process) |
| bicarbonate(noun, element, reaction, component, chemistry) |
| change(verb, nature, action, process) |
| compound(noun, science, structure, chemistry) |
| geography(noun, nature, environment, science) |
| information(noun, nature, environment, science, method) |
| learning(noun, nature, environment, science, method) |
| minerals(noun, nature, environment, water rock minerals) |
| pattern(noun, nature, science, method, chemistry) |
| rainwater(noun, environment, condition, weather, atmosphere) |
| system(noun, nature, science, method, chemistry) |
| biological weathering(expression, nature, environment, condition) |
| volcanic eruption(expression, nature, environment, condition) |
| ability(noun, nature, environment, science, method) |
| acid(noun, element, reaction, component, chemistry) |
| adapt(verb, nature, action, change, process) |
| calcium(noun, element, reaction, component, chemistry) |
| carbon(noun, element, reaction, component, chemistry) |
| composition(noun, science, structure, chemistry) |