Global wind belts and the jet stream

Grade 9 Science Worksheet

Circle the best answer.

1. Read this first

   Use this

   A globe with three loops in each hemisphere.

2. 1.

   In the Hadley cell, what does air do near 30°, by Bo's reading (NOAA)?

   • It stops moving
   • It sinks, forming a high-pressure belt
   • It joins the jet stream down at the ground
   • It rises, forming storms
3. 2.

   In the Ferrel cell, which way does surface air flow, by Esme's reading (NOAA)?

   • Out from the poles as easterlies
   • Toward the equator and westward, as the trades
   • Straight up at 30°
   • Poleward and eastward, as the westerlies
4. 3.

   Over the poles, air in the polar cell sinks. What surface winds result, by Jun's reading (NOAA)?

   • Trade winds from the northeast
   • Polar easterlies blowing out from the polar highs
   • No winds, since the air is still
   • Westerlies blowing from the equator toward the poles
5. 4.

   A wavy jet stream high above the surface. NOAA: Earth's surface moves east at over 1,000 mph at the equator and 0 at the poles. Why does air moving poleward turn east, by Kira's reading?

   • It keeps its eastward speed while the ground below slows
   • The wind pushes it west
   • The Sun pulls it east
   • The ground below it speeds up
6. 5.

   Surface arrows for trades, westerlies and polar easterlies. Going from the equator to 60° N, which pattern fits NOAA's wind belts, by Noah's reading?

   • Westerlies, a high at the equator, then the trades
   • A low at 30°, then the trades
   • Rising air at the equator, northeast trades, a high near 30°, then westerlies
   • Trades from the west, then the easterlies

7. Use this

   Bands of H and L on a globe.

8. 6.

   NOAA: lows lie near the equator and 50° to 60°; highs near 30° and the poles. Which band likely gets the most rain, by Pia's reading?

   • Near 30°, where air sinks
   • Near the equator, where air rises
   • At the poles, where the cold air sinks
   • They each get equal rain
9. 7.

   Model map: a city near 55° N gets frequent storms that move west to east. Which features explain this, by Ren's reading?

   • A low-pressure band and the westerlies
   • The doldrums and the easterlies
   • The subtropical jet at the ground
   • A high-pressure band and the steady trade winds

10. Use this

    A wavy jet stream high above the surface.

11. 8.

    Where are the polar and subtropical jets, by Tala's reading (NOAA)?

    • Polar near 30° N; subtropical near 60° N, over Canada
    • Both at the poles
    • Polar near 50° to 60°; subtropical near 30°
    • Both over the equator
12. 9.

    When are jet streams strongest, by Zee's reading (NOAA)?

    • In winter, when warm-cold contrasts are greatest
    • In summer, when it is hottest
    • In spring, as plants grow
    • They stay equal through the year
13. 10.

    NOAA: the jet stream follows the Sun. Where is the polar jet typically found in Northern Hemisphere summer, by Ari's reading?

    • In the same place as in winter
    • Farther north, near the U.S.-Canadian border
    • Over the South Pole
    • Over the equator