What I Have Learned Activity 4: Look for the Missing Piece! Directions: Complete the selection below by filling the blanks with the words from the word bank. Write your answers on the ANSWER SHEET provided. WORD BANK CFCs clouds greenhouse Earth's surface Fossil fuels Carbon Infrared radiation refrigerants CFC Greenhouse effect Carbon Dioxide Methane atmospherecht Solar radiation The Sun's rays enter the Earth's atmosphere as (1.) About half is reflected or absorbed by the (2) and the atmosphere. The rest reaches the (3.) where it will be absorbed by ocean or land. The Earth also releases heat back toward the space named (4.) Some of the heat will successfully escape back into space and a portion of it is captured and retained by (5.) heat goes back down to warm the surface. This processis called (6.). gases. The like Human activities are changing Earth's natural greenhouse effect. Burning of (7.) coal and oil puts more greenhouse gases into our atmosphere. Left-over foods, garden wastes, and animal wastes produce (8.) gas when compressed and packed together. Moreover, in refrigerators, and foaming agents are rich source spray cans such as propellants, (9.) of (10.) that are very infrared friendly.​