Download App

Types of Rocks — Geography STD 7 — Question

ICSE BoardEnglish MediumSTD 7GeographyTypes of Rocks4 Marks
Question
How are igneous rocks formed?
✓

Answer

Igneous rocks are formed by the cooling and solidification of molten rock called magma, which lies beneath the earth’s crust. These rocks are crystalline and compact. They do not occur in layers or strata nor do they contain fossils.
The cooling and solidification may take place at some depth within the earth or at the surface. The molten magma that reaches the surface of the earth is called lava. Thus, there are two types of igneous rocks classified on the basis of their place of origin – intrusive rocks, which form at some depth in the earth’s crust and extrusive rocks which form at or near the surface of the earth.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[4 Mark Question Answer]" from Types of Rocks→Types of Rocks — all question types→Geography STD 7 question papers→ICSE Board STD 7 question papers→ICSE Board question paper generator→

Similar questions

Describe briefly the major young fold mountains of Europe.
→
Collect information and pictures of the albatross. Stick the pictures in your scrapbook and write the information alongside.
→
Which three ways are used to represent the scale of a map?
→
Name any four major important cities of Europe
→
How is the greenhouse effect created?
→
In the outline map of Africa, mark the features, and answer the questions.
  1. Colour dark green the area where equatorial forests are found. What difficulties were faced by the explorers because of rivers and natural vegetation of the region?
  2. Mark the area that is called an ‘open-air zoo’. Name the vegetation of this region.
  3. Mark the Sahara Desert. Name a plant that best survives in the climate of this region. What are the characteristic features of this plant that help it survive?
  4. Mark the area north of the Atlas Mountains where the Mediterranean climate is found. Which crops does this climate support?
→
Electricity is very important for all of us. We need it for our homes, offices, industries, and agriculture.
Make a list of five different ways in which you can save electricity, for instance, switching off fans, ACs, light at home, and in school when these things are not required.
→
Give an account of the factors that determine the establishment of an industry.
→
Trace your journey: Imagine you are a cotton boll. Write about your journey from the field to somebody’s wardrobe write about all the stages you had to pass through to become a garment.
→
In the outline map of Africa, mark the features, and answer the questions.
  1. Colour dark green the area where equatorial forests are found. What difficulties were faced by the explorers because of rivers and natural vegetation of the region?
  2. Mark the area that is called an ‘open-air zoo’. Name the vegetation of this region.
  3. Mark the Sahara Desert. Name a plant that best survives in the climate of this region. What are the characteristic features of this plant that help it survive?
  4. Mark the area north of the Atlas Mountains where the Mediterranean climate is found. Which crops does this climate support?
→