autumn wiki:
[umn (also fall in North America) is one of the four temperate seasons, the transition from summer into winter.In the temperate zones, autumn is the season during which most crops are harvested, and deciduous trees lose their leaves. It is also the season in which the days rapidly get shorter and cooler (especially in the northern latitudes), and of gradually increasing precipitation in some parts of the world.
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leaf wiki:
>This article is about the leaf, a plant organ. See Leaf (disambiguation) for other meanings. In botany, a leaf is an above-ground plant organ specialized for photosynthesis. For this purpose, a leaf is typically flat (laminar) and thin, to expose the chloroplast containing cells (chlorenchyma tissue) to light over a broad area, and to allow light to penetrate fully into the tissues. Leaves are also the sites in most plants where respiration, transpiration, and guttation take place. Leaves can store food and water, and are modified in some plants for other purposes. The comparable structures of ferns are correctly referred to as fronds.
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