Worksheet Solutions: Earth`s Movements and Changing Landforms | Footprints Class 7: Book Solutions, Notes & Worksheets PDF Download

Multiple Choice Questions (MCQs)

Q1: Which type of landform is primarily formed by the erosion caused by rivers?
(a) Deltas
(b) Mountains
(c) Sand dunes
(d) Rift valleys
Ans: (a) Deltas
Deltas are formed by the deposition of sediment carried by rivers as they enter slower-moving or standing water like seas or lakes.

Q2: What is the primary cause of old fold mountains having rounded peaks and gradual slopes?
(a) Erosion over millions of years
(b) Intense volcanic activity
(c) Rapid sediment deposition
(d) Frequent earthquakes
Ans: (a) Erosion over millions of years
Old fold mountains have been exposed to erosion for extended periods, leading to rounded peaks and more gradual slopes compared to newer mountains.

Q3: Which process contributes directly to the formation of mushroom rocks in desert environments?
(a) Chemical weathering
(b) Glacial deposition
(c) Wind erosion
(d) Riverine flooding
Ans: (c) Wind erosion
Mushroom rocks are formed by wind erosion, where the wind erodes the base of the rock more intensely than the top, giving it a mushroom-like appearance.

Q4: What is the function of a seismograph?
(a) To predict volcanic eruptions
(b) To measure wind speed
(c) To detect and measure earthquake vibrations
(d) To map the ocean floor
Ans: (c) To detect and measure earthquake vibrations
A seismograph is specifically designed to detect and record the vibrations caused by earthquakes.

Q5: Which type of faulting occurs due to rocks moving horizontally in opposite directions under tension?
(a) Normal faulting
(b) Reverse faulting
(c) Tear faulting
(d) None of the above
Ans: (a) Normal faulting
Normal faulting happens when tension causes rocks to move apart, with one block moving downward relative to the other.

Fill in the Blanks

Q1: _______ are created by the deposition of sand along coastlines.
Ans: Beaches

Q2: The theory that describes the movement of Earth's lithospheric plates is known as the _______.
Ans: Theory of Plate Tectonics

Q3: Volcanic eruptions and landslides are examples of _______ earth movements.
Ans: sudden

Q4: Erosion by glaciers often forms landforms called _______ in mountain regions.
Ans: corries or cirques

Q5: The gradual breakdown and decay of rocks at their original place due to atmospheric conditions is known as _______.
Ans: weathering

True/False

Q1: Rift valleys are primarily formed by the deposition of materials. (True/False)
Ans: False
Rift valleys are formed by tectonic movements, specifically through the divergence or pulling apart of lithospheric plates, not by deposition.

Q2: Volcanoes can only form at the boundaries where tectonic plates diverge. (True/False)
Ans: False
Volcanoes commonly form at convergent boundaries where one plate subducts under another, although they can also form at divergent boundaries and hotspots.

Q3: Wind erosion can transport sand particles over significant distances outside desert boundaries. (True/False)
Ans: True
Wind can carry fine sand particles over considerable distances, leading to deposits known as loess.

Q4: An earthquake's intensity is measured on the Mercalli scale. (True/False)
Ans: False
Earthquake intensity is often measured on the Richter scale, not the Mercalli scale which measures the effects of an earthquake.

Q5: Sea waves play no role in shaping coastal landforms. (True/False)
Ans: False
Sea waves significantly influence coastal landforms through processes like erosion, transportation, and deposition of materials.

Match the Columns

Ans:

• A-4: Chemical Weathering is the process involving chemical changes that break down rocks.
• B-2: Sand Dunes are typically formed by the deposition of sand by wind.
• C-1: Seismology is the scientific study focused on analyzing earthquake waves.
• D-5: Old Fold Mountains have rounded peaks due to extensive erosion over millions of years.
• E-3: A spit is a coastal landform that is connected to the mainland at one end, forming due to deposition of sand and pebbles by sea waves.