أوراق عمل Changing Earth’s Surface مع الحل العلوم منهج انجليزي الصف الثامن
Answer Key with Questions
Lesson Check: Changing Earth's Surface
Wind and rain can break down exposed rock
O True
O False
Correct Answer
True
What happens when sediment eroded by water, ice, and wind slows down or stops moving
O A) The sediment is deposited in a new location
O B) The sediment continues to erode
O C) The sediment instantly turns into soil
O D) The sediment mixes with other sediment to become rock
Correct Answer
A) The sediment is deposited in a new location
Answer Key with Questions
Lesson Check: Changing Earth's Surface
Where do erosion and deposition occur in a river Erosion occurs where fast -moving river water picks up soil and moves it
O A) downstream. Deposition occurs where a river current slows as it enters a larger body of water and drops the soil Deposition occurs where fast- moving river water picks up soil and moves it
O B) downstream. Erosion occurs where a river current slows as it enters a larger body of water and drops the soil
C) C) A river erodes land. There is no deposition
O D) A delta forms at the mouth of a river from deposition. There is no erosion
Correct Answer
A) Erosion occurs where fast- moving river water picks up soil and moves it downstream Deposition occurs where a river current slows as it enters a larger body of water and drops the soil
Chemical weathering happens fastest under which conditions
O) A) low temperature
O B) abundant water
O C) glaciation
O D) sparse plant growth
Correct Answer
B) abundant water
Answer Key with Questions
Lesson Check: Changing Earth's Surface
5) How is water a weathering agent
O A) It dissolves minerals in rocks
O) B) It grinds and polishes rock by moving particles against it
O) C) It grows on rocks to break the rock apart
O D) It is not a weathering agent
Correct Answer
A) It dissolves minerals in rocks
6) determines the amount of runoff
A) The amount of vegetation
B) The amount of rain
C) The slope of the land
D) all of the above
Correct Answer
D) all of the above
Answer Key with Questions
Lesson Check: Changing Earth's Surface
7) Mechanical weathering
O A) breaks apart rocks by physical processes
O B) occurs when chemical reactions dissolve or change the minerals in rocks
O C) occurs when iron is exposed to ocygen and water
O D) none of the above
Correct Answer
A) breaks apart rocks by physical processes
8) Chemical weathering
O A) is caused by freezing and thawing
O B) breaks apart rocks by physical processes
C) C) occurs when chemical reactions dissolve or change the minerals in rocks
C) D) none of above
Correct Answer
C) occurs when chemical reactions dissolve or change the minerals in rocks
A satellite camera in space took this picture of northwestem Algeria. showing an impact crater, sedimentary rock layers, and a stream channel flowing out of the crater. Algeria is at the northern end of the African continent. The Algerian landscape includes a large portion of the Sahara Desert and two mountain ranges
Based on evidence in the picture, how has this area been affected by geologic processes
An ancient stream channel left deposits that built up over time to form the sedimentary rocks surrounding the stream. A meteorite's impact changed the direction that the stream flowed, which led to mountain ranges forming downstream from the crater
Rationale: Since the stream channel is flowing out from the crater. the sedimentary rocks are older than the stream channel. In addition, streams erode through sedimentary rocks; they do not create the sedimentary rocks through which they run. There is no evidence that the meteorite's impact changed the direction of the stream
Lava flows from volcanic eruptions created sedimentary rock layers; heavy rains
O B) formed a stream channel: and a meteorite's impact evaporated the stream water, leaving the area without a water source and creating a desert
Rationale: Sedimentary rock is not formed by lava flows. Heavy rains may have contributed to the stream channel, but since the stream channel is flowing out of the crater it is likely younger than the impact. The impact was not large enough and the amount of water in the stream channel is not great enough to result in desertification of the area
A meteorite impacted Earth, creating a low- lying area where water filled in to
O C) create a stream channel. The stream channel carried sediment with it, eventually forming the surrounding layers of sedimentary rock
Rationale: Streams erode through sedimentary rocks; they do not create the sedimentary rocks through which they run. In addition, the picture clearly shows the same layers of sedimentary rocks both upstream and downstream from the crater; thus any sediment being carried in the stream channel would not be deposited upstream of the crater
Layers of sediments were compacted to form sedimentary rock; a meteorite
O D) impacted Earth after the sedimentary layers were formed; and water erosion formed a stream channel from the meteorite's impact zone
Rationale: The crater cuts through the layers of sediment indicating the layers were
Answer Key with Questions
Lesson Check: Changing Earth's Surce
deposited before the impact. The stream runs from the impact crater so water erosion must have occurred after the meteorite struck
Correct Answer
Layers of sediments were compacted to form sedimentary rock; a meteorite impacted Earth after the sedimentary layers were formed; and water erosion formed a stream channel from the meteorite's impact zone
Answer Key with Questions
Lesson Check: Changing Earth's Surface
Correct Answer
Answers may vary
Water flows through cracks in the surface rocks and dissolves the limestone over thousands Of years. (The water is slightly acidic and a chemical reaction occurs between the acidic groundwater and carbonic limestone. This process is a form of chemical weathering.) As it flows through the cave, water carries the sediment away through the process Of erosion making the size of the cave openings larger over time
Evidence of Understanding
Student response provides clear evidence usng the dimensions• to make sense of scientific phenomena aruor to design solutions to problems. Student is able to
• describe caves form in
AND
include evidenæ from the dagram support the descriptjm
Student response provides partial evidence of using the to make of saentific phenomena and / or to design sdubons to prodems. The resporse lacks some critical information and details or cmtatm some errors. Student is aue to describe tww caves fom in limestone BIJT does not include evidence tom the diagram OR the evidence not support the description
response is inccnwete prcwides minimal evdence using ttE to rne sense of scientific phewT"ena and'br to design solubms Stl-xjent does rd respond or stu&N response is hæcurae, irelevmt, or cottars nsuffaent evideme of uslr-g cimew:ns to make sense of saentific chemnena
Scoring Notes
Possitie answers
Wær flows through cracks in surface rocks dissolves the limestorE over thousands of years. (The water is slightly acidic and a chemical reaction occurs between the acidic woundwater and carbonic limestone. This process is a form Of chemical weathering.) As it flows through the cave, water carries sediment away thrmgh process Of erosion, making the size cave larger over time