ICSE Class 9 Answered

Five main characteristics of sedimentary rocks are:

• Sedimentary rocks are also known as secondary rocks as they are formed by the sediments of other rocks denuded and deposited by the agents of gradation.

• Sedimentary rocks are largely found on the Earth’s surface. They cover 75% area of the Earth.

• These rocks are generally not crystalline in nature. They are soft and have many layers as they are formed due to the deposition of sediments.

• These rocks may have the presence of the remains of plants and animals in between various layers.

• Sedimentary rocks may be sub divided on the basis of the nature of sediment, origin and composition.