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| An instrument that uses air pressure to record height, such as the height of a plane. |
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| An instrument to measure wind speed. |
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| A group of plants that produce seeds enclosed within an ovary, which may mature into a fruit. |
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| Plants that die after one growing season. |
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| Reproduction involving only one parent. |
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| The Earth's atmosphere is primarily nitrogen and oxygen. The atroposphere extends from the surface to about 10 km; the stratosphere from 10 km to 50 km; the mesosphere from 50 km to 80 km; and the thermosphere is the atmosphere beyond 80 km. |
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| aurora borealis (northern lights) |
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| Light emission from the upper atmosphere that appear in many shapes and colors. |
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| Fluid that circulates throughout the body of an animal, distributing nutrients, and usually oxygen. |
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| A layer of tree branches and other vegetation elevated above the ground. |
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| A colorless, odorless gas that is important in the Earth's atmospheric greenhouse effect. Frozen CO2 is dry ice. |
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| A substance that can lead to cancer. |
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| A malignant tumor, which forms in the skin and outside of internal organs. |
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| An organism that eats meat, which includes animals, fungi, and plants. |
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| An instrument that measures cloud height. |
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| The fundamental unit of all life. The cell consists of an outer plasma membrane, the cytoplasm, and genetic material (DNA). |
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| A temperature scale in which water freezes at 0 degrees and boils at 100 degrees. |
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| A cancer treatment that includes chemicals toxic to malignant cells. |
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| A warm, dry wind on the eastern side of the Rocky Mountains. |
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| The green substance that absorbs light during photosynthesis. |
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| A single DNA molecule, a tightly coiled strand of DNA, condensed into a compact structure. |
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