Glaciers, wind and landslides reshape the land

Grade 9 Science Worksheet

Circle the best answer.

2. 1.

   Along the sides of a glacier, debris piles into long ridges. What are they, by Bo's reading (NPS)?

   • Cirques
   • Sand dunes
   • Lateral moraines
   • Terminal moraines
3. 2.

   Where two glaciers flow together, their lateral moraines join. What forms, by Esme's reading (NPS)?

   Use the picture in question 1.

   • A terminal moraine along the side
   • A medial moraine down the middle
   • A cirque
   • A V-shaped valley
4. 3.

   A dune with a gentle windward side and a steep slip face. On a dune, sand moves up the gentle windward side and slides down the steep slip face (USGS). Which way does the dune move, by Kira's reading?

   • Straight up
   • Downwind
   • It stays in place
   • Upwind
5. 4.

   Bars comparing loess thicknesses. USGS: the thickest known loess, windblown silt, is 335 m; in the Americas it is generally 20 to 30 m. About how many times thicker is the thickest than 30 m, by Luz's math?

   • About 11 times
   • About 365 times
   • About 305 times
   • About 1.1 times
6. 5.

   A dune with a gentle windward side and a steep slip face. NPS: the Great Sand Dunes reach 741 feet (226 m), the tallest in North America. What built them, by Milo's reading?

   • Streams supplying sand, and wind piling it up against mountains
   • Abrasion by wind grinding the dunes out of solid mountain bedrock
   • Glaciers carving the sand
   • Creep moving sand uphill
7. 6.

   USGS: falls are abrupt movements of rock from steep slopes, by free fall, bouncing and rolling. Where would fallen boulders pile up, by Noah's reading?

   • At the base of a steep cliff
   • On top of the cliff
   • Inside a sand dune
   • Spread evenly over a gentle hill

8. Read this first

   Use this

   Four movement cards, labeled A to D.

9. 7.

   Which of these movements is fastest, by Pia's reading (USGS, NPS)?

   • Soil creep
   • A rock fall
   • Seasonal creep
   • A glacier's flow
10. 8.

    Which slope movement is a water-soaked mix of debris and soil that flows like wet cement, by Ren's reading (NPS)?

    • A debris flow
    • Creep
    • A sudden rock fall
    • Deflation
11. 9.

    Soil on a slope creeps 1 cm a year (example data). How far does it move in 300 years, by Zee's math?

    • 300 m
    • 30 m
    • 3 m
    • 0.3 m
12. 10.

    A glacier's face retreats 20 m a year while its ice flows forward 80 m a year (example data). How far does a boulder riding on the ice travel in 10 years, by Ari's math?

    • 800 m forward, even as the face retreats
    • 600 m forward
    • 1,000 m forward, adding the retreat to the flow
    • 200 m backward