1 The galah is one of the most abundant and widespread cockatoo species. 2  The galah is easily distinguished from other cockatoos by its distinctive grey and pink plumage and its short pink to white crest.he galah can easily be distinguished from other cockatoo species by its distinctive pink and grey plumage. The upperparts of the galah are pale grey, while its head, neck, underparts and underwing-coverts are a deep rose-pink.
Volcanism is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics and volcanic gases erupt through a break in the surface called a vent.agma that reaches the surface to become lava cools rapidly resulting in rocks with small crystals such as basalt. Some of this magma may cool extremely rapidly and will form volcanic glass (rocks without crystals) such as obsidian.
Image on the right courtesy of http://www.csmate.colostate.edu). Carbonation is the process of rock minerals reacting with carbonic acid. Carbonic acid is formed when water combines with carbon dioxide. Carbonic acid dissolves or breaks down minerals in the rock.hemical weathering is the weakening and subsequent disintegration of rock by chemical reactions. These reactions include oxidation, hydrolysis, and carbonation. These processes either form or destroy minerals, thus altering the nature of the rockâs mineral composition.