Igneous rocks are said to be acidic when they contain high proportion of:

Related MCQs

• Consider the following statements: 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 Which of the above statements is/are correct? [NDA 2002]
• Which of the following are true with regard to igneous rocks? 1. They are formed inside the earth, under great pressure 2. They do not occur in layer 3. They are mostly crystalline in nature 4. They contain fossils
• Which of the following are true with respect to sedimentary rocks? 1. The rocks are deposited in layers 2. The particles of rocks are at times wholly of organic nature 3. The rocks are not crystalline 4. Their structure is determined by great pressure or heat
• Igneous rocks are formed from molten rock material. Which one of the following is not an igneous rock?
• The type of igneous rocks which are formed midway between volcanic and plutonic rocks, are known as :
• Which of the following are true with regard to fold mountains? 1. They often act as climatic barriers 2. They receive heavy rain or snow which give rise to rivers 3. They are rich in minerals 4. They pose no problem, to communication as they contain many passes
• The best representative of the acid igneous rocks is : [IAS 2003]
• The igneous rocks are formed due to : [CDS 1992]
• Carbonaceous rocks which produce coal and of belong to the category of rocks called
• If the original day sediments are subjected to high temperature and pressure, they successively change into rocks, the correct order of which is :