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Chapter 2-2 Science
6th Grade Study Cards
| Term | Definition |
|---|---|
| water cycle | _________ ___________ is the continuous process by which water moves from Earth's surface to the atmosphere and back |
| evaporation; evaporates | ___________is the process by which molecules of liquid water absorb energy and change to a gas. In the water cycle, liquid water _______________ from oceans, lakes, and other surfaces and forms water vapor, a gas, in the atmosphere. |
| evaporation, condensation, and precipitation | What processes are involved in the water cycle? |
| sun | The energy for evaporation come from the heat of the _____. |
| condensation | As the water vapor rises higher in the atmosphere, it cools down. The cooled vapor then turns back into tiny drops of liquid water. The process by which a gas changes to a liquid is called _________________. |
| precipitation | As more water vapor condenses, the drops of water in the cloud grow larger. Eventually the heavy drops fall back to Earth as ________________--rain, snow, sleet, or hail. |
| evaporation | What process causes water from the surface of the ocean to enter the atmosphere as water vapor? |
| =precipitation | In which step of the water cycle does water return the Earth's surface? = |
| 2. sun's energy | 2. What drives the water cycle? oceans clouds sun's energy precipitation |
| 3. evaporation | 3. Water vapor given off by water, plants, and animals is called precipitation. condensation. evaporation. runoff. |
| 1. All of the above | 1. Which of the following is precipitation? hail snow rain all of the above |
| 3. Clouds grow larger, eventually heavy drops fall back to earth as precipitation.---4.The precipitation soaks into soil and becomes ground water or the precipitation may run off the land, eventually flowing back into a river or ocean. | The Water Cycle diagram 1. Water evaporates---2. Clouds form.---- |
| In ecosystems, the processes by which carbon and oxygen are recycled are linked to . . . | Producers, consumers, and decomposers play roles in recycling carbon and oxygen. |
| The Carbon Cycle | Producers (Plants) take in carbon dioxide and use carbon to make sugar molecules. When consumers eat producers, they take in sugar molecules and release carbon dioxide. When consumers & producers die, decomposers return carbon compounds to the soil & air. |
| The Oxygen Cycle | Like carbon, oxygen cycles through ecosystems. Producers release oxygen as a result of photosynthesis. Most organisms take in oxygen from the air or water and use it to carry out their life processes. |
| Human Impact | Human activities that affect the levels of carbon and oxygen in the atmosphere: 1. Humans clear forests, releasing carbon into the air 2. Humans burn fuels for energy, releasing carbon compounds into the air. 3. Humans burn trees releasing even more. |
| 1. Oxygen Cycle--atmosphere gains oxygen 2. Oxygen Cycle--atmosphere loses oxygen | 1. Plants produce oxygen 2. Animals breathe in oxygen--includes humans |
| Nitrogen Cycle--Study Figure 8 p. 52 | In the _________ ___________free nitrogen from the air is fixed in to compounds. Consumers can then use these nitrogen compounds in carrying out their life processes. |
| cannot | The air around you is about 78% "free" nitrogen gas. However, most organisms _______ use nitrogen gas. |
| nitrogen fixation | Most organisms can use nitrogen only once it has been "fixed," or combined with other elements to form nitrogen-containing compounds. The process of changing free nitrogen into a usable form of nitrogen is called ____________ ___________. |
| legumes, include clover, beans, peas, alfalfa, and peanuts. ; legumes | Most nitrogen fixation is performed by certain kinds of bacteria that live in bumps called nodules on the roots of certain plants, known as ___________________________. The relationship between the bacteria and the ________ is an example of mutualism. |
| How does nitrogen return to the environment? Outline the major steps in the nitrogen cycle p. 52-53 | 1. nitrogen is fixed 2. producers use it to build proteins and complex compounds 3.Decomposers break down these compounds in animal wastes and the dead organisms. 4.Decomposition returns nitrogen back into the soil to producers many times 5.Back to air |
| nitrogen | Like carbon, __________ is a necessary building block in the matter that makes up living things. |
| The community would slowly diminish and die out | What might happen in a community of all the nitrogen-fixing bacteria died? |
Created by:
dsimmons
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