acti - aksa
- actinides
- actinium
- actinolite
- actinolite asbestos
- actinolite schist
- actinolitic greenschist facies
- actinometer
- actinometry
- actinomorphic
- actinomorphous
- actinomyces
- actinostele
- actinouranium
- actinula
- activated adsorption
- activated carbon
- activated clay
- activated complex
- activated water
- activation
- activation analysis
- activation cross section
- activation energy
- activation logging
- activation method
- activation of platform
- activator
- active fault
- active folding
- active glacier
- active humus
- active hydrogen
- active plate
- active remote sensing
- active tectonic pattern
- active volcano
- active water
- activity
- activity coefficient
- activization
