Ugwu bụ nnukwu ala nke na-ebili n'elu ala ndị gbara ya gburugburu na mpaghara dị oke, na-abụkarị n'ụdị elu. Ugwu na-adịkarị elu karịa ugwu. Ugwu na-etolite site na tectonic ike ma ọ bụ mgbawa ugwu. Ike ndị a nwere ike ime ka elu ụwa dị elu. Ugwu na-eji nwayọọ nwayọọ na-eme site n'omume nke osimiri, ọnọdụ ihu igwe, na glaciers. Ugwu ole na ole bụ ugwu dịpụrụ adịpụ, ma ọtụtụ na-eme na nnukwu ugwu. Ajụjụ: Gịnị na-adịkarị elu karịa ugwu?
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