Important Questions: Inside Our Earth - Class 7 MCQ

Magma is extremely hot liquid and semi-liquid rock located under Earth's surface. ... This magma can push through holes or cracks in the crust, causing a volcanic eruption. When magma flows or erupts onto Earth's surface, it is called lava. Like solid rock, magma is a mixture of minerals.

A mineral is a naturally occurring, solid that has a definite chemical composition and crystal structure. In order for a substance to be called a mineral, it must have all four of the characteristics described in this definition.

Hard rocks were igneous and metamorphic rocks.
Soft rocks were deemed to the sedimentary rocks.
“Hard” rocks and the minerals they contained or gave birth to, were the cutting edge of science before all the minerals were discovered.
 “soft” rocks seem to be the place of riches, in a world focused on wealth that comes by the barrel rather than by the ounce or carat.

The Red Fort is made of red sandstone, which is a type of hard rock used for building structures like forts and buildings.