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
   • Lateral moraines
   • Sand dunes
   • 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 terminal moraine along the side
   • A cirque
   • A medial moraine down the middle
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.

   • Creep, which carved the bowl
   • A river, which cut the U
   • A glacier: it carved the U and the bowl and left a moraine
   • Wind, which piled up the rubble
5. 4.

   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?

   • Upwind
   • Straight up
   • It stays in place
   • Downwind
6. 5.

   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 1.1 times
   • About 11 times
   • About 365 times
   • About 305 times
7. 6.

   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
8. 7.

   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?

   • On top of the cliff
   • Inside a sand dune
   • Spread evenly over a gentle hill
   • At the base of a steep cliff
9. 8.

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

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

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

    • 125 m
    • 2.5 km
    • 250 m
    • 4 km
12. 10.

    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 9.

    • 0.3 m
    • 30 m
    • 300 m
    • 3 m