Glaciers, wind and landslides reshape the land

Grade 9 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   A classmate says a retreating glacier's ice flows back uphill. Which reply fits NPS, by Esme's reading?

   • No; the face retreats as melt wins, but the ice still flows downhill
   • Correct; retreat means uphill flow
   • No; retreating glaciers advance faster
   • Correct; the ice freezes in place
2. 2.

   A student says U-shaped valleys are cut by rivers. Which reply fits NPS, by Jun's reading?

   • No; creep carves the U's
   • Correct; wind cuts U's
   • No; rivers cut V's, and glaciers scour U's
   • Correct; rivers cut broad U's through the valley floor
3. 3.

   A student says creep is a kind of fast landslide. Which reply fits USGS, by Kira's reading?

   • No; creep is imperceptibly slow and steady
   • No; creep is wind moving sand
   • Correct; creep is a rock fall
   • Correct; creep moves several meters each second
5. 4.

   A moraine lies 3 km below a glacier's face, which has retreated 15 m a year (example data). About how long ago was the face at the moraine, by Luz's math?

   • About 2,000 years
   • About 20 years
   • About 200 years
   • About 45,000 years
6. 5.

   A dune migrates 12 m a year (example data). How long does it take to cross a 600 m valley floor, by Milo's math?

   Use the picture in question 4.

   • About 7,200 years
   • About 50 years
   • About 5 years
   • About 588 years
7. 6.

   Four evidence cards, labeled A to D. Which evidence best shows wind erosion in a desert, by Ren's reading (USGS)?

   • Striations scratched into bedrock
   • Moraines and cirques
   • Curved tree trunks and small soil ripples on slopes
   • Blowouts, desert pavement and ventifacts
8. 7.

   Striations on bedrock run north to south, and a terminal moraine lies at the south end (model data). Which way did the ice move, by Tala's reading?

   • It cannot be told
   • From south to north
   • From east to west
   • From north to south
9. 8.

   Which summary of glaciers fits NPS, by Zee's reading?

   • Ice builds dunes and ventifacts
   • Ice carves moraines and drops cirques
   • Ice flows uphill as it retreats, cuts V's and carves river bends
   • Ice flows downhill, carves U's and cirques, and drops moraines
10. 9.

    Which summary of wind's work fits USGS, by Ari's reading?

    • Abrasion lifts grains; deflation grinds rock
    • Deflation lifts grains; abrasion grinds rock; dunes move downwind
    • Dunes move upwind as sand climbs the slip face
    • Wind carves U-shaped valleys
11. 10.

    Which summary of mass wasting fits USGS and NPS, by Bo's reading?

    • Gravity moves rock and soil downslope, from slow creep to fast falls
    • Gravity moves rock and soil uphill
    • Wind moves rock and soil downslope
    • Creep is fast, and falls are slow