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Unit 3 DFA Science
DFA AND TEST
| Question | Answer |
|---|---|
| Troposphere | Closest to Earth; where weather happens (clouds, rain); airplanes fly in lower part. |
| Stratosphere | Contains the ozone layer; commercial jets sometimes cruise near its lower region; temperature increases with altitude here. |
| Mesosphere | Meteors burn up here; temperatures decrease with altitude. |
| Thermosphere | Auroras occur; very thin air; temperature increases with altitude; satellites begin to orbit in upper parts. |
| Exosphere | Outermost layer; very sparse gas; satellites orbit here. |
| Evaporation | Liquid water becomes water vapor. This process absorbs energy (heat from the Sun). |
| Transpiration | Water released from plants into the air; also absorbs energy (driven by heat for evaporation from leaves). |
| Condensation | Water vapor cools and forms droplets (clouds). Condensation releases energy into the atmosphere (latent heat). |
| Precipitation | Droplets fall as rain/snow due to gravity — this is driven by gravity. |
| Surface runoff and infiltration/percolation | Water moves across or into the ground; largely driven by gravity. |
| Sublimation | Solid (ice/snow) becomes water vapor, absorbs energy. |
| Cloud formation and condensation evidence | Condensation requires cooling of water vapor and tiny particles (dust, smoke) called condensation nuclei. Look at forecast clues: high relative humidity (near 100%) |
| Surface ocean currents and climate effects | Warm the air above them. Tend to make the coastal climate warmer and more humid (can make climates warm and wet or warm and dry depending on local conditions). |
| Barometer (measures air pressure) | Falling pressure often means stormy or unsettled weather is approaching. Rising pressure suggests calming/sunnier weather. |
| Relative humidity | High humidity (close to 100%) indicates air is nearly saturated — fog, dew, or precipitation likely. |
| Meteorologist duties | Collect and analyze data, use technology and observations to make weather predictions (choose answers about collecting/analyzing data and using technology and global patterns). |
| Cold front: | A cold air mass runs into a warm air mass; cold air pushes under the warm air, forcing it up — often triggers thunderstorms and abrupt temperature drops. |
| Warm front | A warm air mass runs into a cold air mass; warm air rises over cooler air and brings gradual cloudiness and steady precipitation; temperature usually rises after it passes. |
| Stationary front: | Neither air mass can move the other significantly; weather near a stationary front can remain cloudy and wet for days. |
| Occluded front: | A warm air mass is caught between two colder air masses (a faster cold front overtakes a warm front), often producing complex weather. |
| Convection current: | Warm air rises and cool air sinks |
| Sea breeze (day): | Land heats more quickly, warm air rises over land; cooler air over the ocean moves toward land — breeze from sea to land. |
| Land breeze (night): | Land cools faster at night, air flows from land to sea. |
| Natural hazards | Tornadoes, Hurricanes, Tsunami, Landslide, and Volcanic Eruption |
| 0° to 30° = | Tropical region (warm, near equator) |
| 30° to 60° = | Temperate region (seasons) |
| 60° to 90° = | Polar region (cold) |
| Thunderstorms: | More likely to increase in intensity as temperatures rise. (Choose “increase”.) |
| Hurricanes: | Likely to produce heavier rain events and more dangerous/stronger winds (choose “heavier” and “more dangerous”). |
| Precipitation forms — what factor matters most? | Temperature determines whether precipitation falls as rain, snow, sleet, or freezing rain. Higher/lower temperatures in the air column and near the surface determine the form. Correct choice: temperature. |
| Model for evaporation and condensation — safe classroom method | Fill a container with water, cover it with plastic film (or a lid) and place it in sunlight. Water will evaporate, condense on the cover, and drip — this models evaporation and condensation. (Correct answer: container + plastic film in sunlight.) |
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