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

   A valley has a U-shaped cross-section, a bowl at its head and a ridge of mixed rubble across its mouth. What shaped it, by Jun's reading?

   Use the picture in question 1.

   • A glacier: it carved the U and the bowl and left a moraine
   • Creep, which carved the bowl
   • Wind, which piled up the rubble
   • A river, which cut the U
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 365 times
   • About 11 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?

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

7. Read this first

   Use this

   Four movement cards, labeled A to D.

8. 6.

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

   • Soil creep
   • Seasonal creep
   • A rock fall
   • A glacier's flow
9. 7.

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

   • Creep
   • A sudden rock fall
   • A debris flow
   • Deflation
11. 8.

    A glacier flows 100 m a year (example data). How far does its ice move in 25 years, by Tala's math?

    • 250 m
    • 125 m
    • 4 km
    • 2.5 km
12. 9.

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

    Use the picture in question 8.

    • 300 m
    • 30 m
    • 0.3 m
    • 3 m
13. 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?

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