Video Transcript. Hi everyone, Kevin Smith, TubaLove here, talking about different types of tubas. And when I say type, I'm talking specifically about the different types of keys that are available. This happens to be what's called a C tuba. They're also B flat tubas, and E flat, as well as F tubas.
Soil quality decline is one of the main causes of land degradation and is considered to be responsible for 84% of the ever diminishing acreage. Year after year, huge acres of land lost due to soil erosion, contamination and pollution.
The organic matter content, climate, soil drainage, and mineralogy affect soil color. Most soil minerals are naturally white or light gray. Color is strongly influenced by humus and iron compounds.They change the outer color of the soil much like a coat of paint.he organic matter content, climate, soil drainage, and mineralogy affect soil color. Most soil minerals are naturally white or light gray. Color is strongly influenced by humus and iron compounds.