Worksheet Solutions: Understanding the Earth | Footprints Class 7: Book Solutions, Notes & Worksheets PDF Download

Multiple Choice Questions (MCQs)

Q1: What is the main driving force behind the formation of igneous rocks?
(a) Heat and pressure
(b) Accumulation of sediments
(c) Cooling and solidification of lava or magma
(d) Transformation under intense heat and pressure
Ans: (c) Cooling and solidification of lava or magma

Q2: Which layer of the Earth's structure is partially molten and flows like a liquid?
(a) Crust
(b) Mantle
(c) Core
(d) Asthenosphere
Ans: (d) Asthenosphere

Q3: Sedimentary rocks are primarily formed by:
(a) Accumulation and compression of sediments
(b) Cooling and solidification of lava or magma
(c) Transformation under intense heat and pressure
(d) Weathering and erosion of existing rocks
Ans: (a) Accumulation and compression of sediments

Q4: Which type of rock is characterized by its lack of fossils and its crystalline nature?
(a) Igneous
(b) Sedimentary
(c) Metamorphic
(d) None of the above
Ans: (c) Metamorphic

Q5: The main purpose of minerals like bauxite and haematite, found in rocks, is for:
(a) Road construction
(b) Energy production
(c) Agriculture
(d) Industrial use
Ans: (d) Industrial use

True or False Statements

Q1: Sedimentary rocks are typically harder than igneous rocks.
Ans: False
Sedimentary rocks are generally softer than igneous rocks.

Q2: The upper mantle of the Earth is solid throughout.
Ans: False
The upper mantle contains a partially molten layer known as the asthenosphere.

Q3: Metamorphic rocks are formed by the cooling and solidification of lava or magma.
Ans: False
Metamorphic rocks are formed by the transformation of existing rocks under heat and pressure.

Q4: Minerals like quartz and feldspar are examples of sedimentary rocks.
Ans: False
Quartz and feldspar are common rock-forming minerals but are not sedimentary rocks.

Q5: The rock cycle describes the continuous process of formation, transformation, and recycling of rocks on Earth's surface.
Ans: True
The rock cycle explains how different types of rocks are formed, transformed, and recycled over time.

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