Glaciers, wind and landslides reshape the land
Grade 9 Science Worksheet
Circle the best answer.
Along the sides of a glacier, debris piles into long ridges. What are they, by Bo's reading (NPS)?
- Sand dunes
- Terminal moraines
- Lateral moraines
- Cirques
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 cirque
- A terminal moraine along the side
- A medial moraine down the middle
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
- Wind, which piled up the rubble
- A glacier: it carved the U and the bowl and left a moraine
- A river, which cut the U
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?
- It stays in place
- Upwind
- Straight up
- Downwind
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 305 times
- About 1.1 times
- About 11 times
- About 365 times
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
- Glaciers carving the sand
- Creep moving sand uphill
- Abrasion by wind grinding the dunes out of solid mountain bedrock
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?
- Inside a sand dune
- Spread evenly over a gentle hill
- At the base of a steep cliff
- On top of the cliff
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 debris flow
- A sudden rock fall
- Creep
- Deflation
Soil on a slope creeps 1 cm a year (example data). How far does it move in 300 years, by Zee's math?
- 3 m
- 0.3 m
- 300 m
- 30 m
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?
- 200 m backward
- 600 m forward
- 800 m forward, even as the face retreats
- 1,000 m forward, adding the retreat to the flow