- geitonogamy
- Fertilisation between different flowers of the same genetical individual.
- geocarpy
- The below-ground maturation of seeds which developed from above-ground flowers, such as in peanuts
- geophyte
- A plant with below ground storage rhizomes or bulbs and an apical bud buried deep below ground (geo-) during an adverse season
- geothermal heat flux
- The amount of heat moving steadily outward from the interior of the earth through a unit area in a unit of time
- glacial
- (a) Relating to the period of time during an ice age when glaciers advance because of colder temperatures
(b) Involving glaciers and moving ice. Usually pertaining to processes associated with glaciers
- glaciation
- (a) Period of time during an ice age when glaciers advance because of colder temperatures
(b) Involving glaciers and moving ice. Usually pertaining to processes associated with glaciers
- glacier
- A large long lasting accumulation of snow and ice that develops on land. Most glaciers flow along topographic gradients because of their weight and gravity. Also defined as: A mass of snow and ice flowing mostly down gradient due to gravity
- glacier forefield
- The recently released land area in front of a glacier
- glacier surge
- A rapid forward movement of the snout of a glacier. Also described as the rapid, wavelike downglacial ice movements which cause sudden advances of the ice margin
- Gondwana
- The palaeozoic land mass that unified today's Africa, India, Australia and South America.
- graminoid
- Grass-like
- guild
- A group of organisms, possibly unrelated taxonomically, with similar foraging habits and similar roles in a community
- gynoecium
- The female part of a flower
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