Lithosphere - Study Mode

[#61] Which one of the following is a Sedimentary Rock?
Correct Answer

(D) Arkose

Explanation

Solution: Arkose is a type sand-stone with about 25% feldspar. It is a type of sedimentary rock compound of rock fragments.

[#62] Changing of colour of a rock into yellow or red is due to
Correct Answer

(B) Oxidation

Explanation

Solution: Changing of colour of a rock into yellow or red is due to oxidation. It is the process or result of oxidizing or being oxidized.

[#63] Which of the statements is/are correct? 1. Igneous rocks are classified into Extrusive and Intrusive rocks. 2. Sedimentary rocks are also called as Primary rocks 3. Marble is an example of Metamorphic rocks 4. Coal is a sedimentary rock
Correct Answer

(C) 1, 3 and 4

Explanation

Solution: The statements that are correct are igneous rocks are classified into extrusive and intrusive rocks, marble is an example of metamorphic rocks and coal is a sedimentary rock.

[#64] Mount Gamkonora, highest peak of Halmahera Island, was burst in 2007. In which country is it located?
Correct Answer

(B) Indonesia

Explanation

Solution: Mount Gamkonora is stratovolcano which erupted
in 2007. It is located on Halmahera island in Indonesia. It has shifting eruption centres which has lead to an elongated series of craters along N-S trending rift.

[#65] Which of the following predominantly acts as the agent of chemical erosion of soil?
Correct Answer

(C) Underground water

Explanation

Solution: Underground water predominantly acts as the agent of chemical erosion of soil. Chemical weathering changes the molecular structure of rocks and soil. The important characteristics of surface conditions that lead to chemical weathering are the presence of water (in the air and on the ground surface), the abundance of oxygen, and the presence of carbon dioxide, which produces weak carbonic acid when combined with water.