Subsoil: This layer has normally less organic matter than the A horizon, so its colour is mainly derived from iron oxides. Iron oxides and clay minerals accumulate as a result of weathering. In a soil, where substances move down from the topsoil, this is the layer, where they accumulate.
Note: This information has been taken out of a website.
Answer:
26 cantons
Explanation:
Zürich (ZH)
Bern / Berne (BE)
Luzern (LU)
Uri (UR)
Schwyz (SZ)
Unterwalden (Obwalden (OW) / Nidwalden (NW))
Glarus (GL)
Zug (ZG)
Freiburg / Fribourg (FR)
Solothurn (SO)
Basel (Basel Stadt (BS)/ Basel Land (BL))
Schaffhausen (SH)
Appenzell (Appenzell Ausserrhoden (AR) / Appenzell Innerrhoden (AI))
Sankt Gallen (SG)
Graubünden (GR)
Aargau (AG)
Thurgau (TG)
Ticino (TI)
Vaud (VD)
Valais / Wallis (VS)
Neuchâtel (NE)
Genève (GE)
Jura (JU)
Two human activities that increase the rate of erosion include farming and deforestation. Both make the top cover of the soil loose making it very easy for it to be carried away by agents of erosion such as wind and water. On the other hand, two natural events that can lead to increased <span>erosion rate include floods and earthquake.</span>
