Diagram of the layers within Earth's atmosphere. Troposphere. The troposphere starts at the Earth's surface and extends 8 to 14.5 kilometers high (5 to 9 miles). This part of the atmosphere is the most dense.Almost all weather is in this region. Stratosphere. The stratosphere starts just above the troposphere and extends to 50 kilometers (31 miles) high.he troposphere starts at the Earth's surface and extends 8 to 14.5 kilometers high (5 to 9 miles). This part of the atmosphere is the most dense. Almost all weather is in this region.
conus. n, pl-ni. 1. (Anatomy) anatomy zoology any of several cone-shaped structures, such as the conus medullaris, the lower end of the spinal cord. 2. (Zoology) anatomy zoology any of several cone-shaped structures, such as the conus medullaris, the lower end of the spinal cord. continental United States.
conÂ·iÂ·fer (kÅnâ²É-fÉr) Any of various trees or shrubs that bear cones. Conifers are dependent on the wind to blow pollen produced by the male cones to the female cones, where seeds develop. Conifers are usually evergreen, often have needle-shaped or scale-like leaves, and include the pine, fir, spruce, hemlock, and yew. See Note at pollination. Thesaurus Antonyms Related Words Synonyms Legend: Switch to new thesaurus . Noun: 1. conifer - any gymnospermous tree or shrub bearing cones. coniferous tree. pine, pine tree, true pine - a coniferous tree