outline (noun) 'owt-līn a line showing the outside edge She drew an outline of the city. oxygen (noun) 'ok-si-jen a gas with no color or smell that most living things need Plants release oxygen into the air. ozone layer (noun) 'ō-zōn 'lā-yurr an atmospheric layer above Earth The ozone layer protects people from harmful radiation from the Sun. P pad (noun) pad a soft area for cushioning There was a soft pad on the ground, so the spider landed safely. perspective (noun) purr-'spek-tiv a way to make a shape look three-dimensional Artists often use perspective to make objects look the correct size. petition (noun) puh-'ti-shun a formal request signed by many people People can sign petitions to demand changes to laws. phenomena (noun) fe-'no-me-nuh special things or events that happen in nature I travel to find weather phenomena like tornadoes. photosynthesis (noun) fō-tō-'sin-the-sis how a plant uses sunlight to change water and carbon dioxide into food Green plants use photosynthesis to stay healthy and grow. physical activity (noun) 'fiz-i-kuhl ak-'tiv-i-tē the condition of being active The children do a lot of physical activity such as playing soccer. pick up (verb) pik 'up to lift up or bring on The bus picks up the students after school. place value chart (noun) 'plās 'val-ū 'charrt a chart showing how the position of a digit determines value The number 5 was in the tens place in the place value chart. planet (noun) 'pla-nit a large body in outer space that circles around the Sun Saturn is one of eight planets in our solar system. 343 DICTIONARY outline planet
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