18.10 loengu slaidid
https://docs.google.com/presentation/d/1uob1IZVk53p7UEfxN7O3ILtUIRemW9yO...
https://docs.google.com/presentation/d/1uob1IZVk53p7UEfxN7O3ILtUIRemW9yO...
Muld ja maakatte muutus: https://drive.google.com/file/d/17vAvoLHYKMtK6AXvqbJcA-XErQh8QtDm/view?u...
https://docs.google.com/presentation/d/1x9Q7bapOb7fUFLIBXAf7nlKDoNZJ0vSN/edit?usp=driv...