What time of rock is igneous?
When they are formed inside of the earth, they are called intrusive, or plutonic, igneous rocks. If they are formed outside or on top of Earth’s crust, they are called extrusive, or volcanic, igneous rocks. Granite and diorite are examples of common intrusive rocks.
What is Dharwar system?
Dharwar system Dharwar Rock System is special because it is the first metamorphic sedimentary rocks in India. They are named Dharwar system because they were first studied in Dharwar region of Karnataka. But they are also found in Aravallis, Tamil Nadu, Chotanagpur plateau, Meghalaya, Delhi, and the Himalayas region.
What are the igneous types?
The most common types of igneous rocks are:
- andesite.
- basalt.
- dacite.
- dolerite (also called diabase)
- gabbro.
- diorite.
- peridotite.
- nepheline.
Is Dharwar and Dharwad same?
Dharwad is an administrative district of the state of Karnataka in southern India and is the cultural headquarters of North Karnataka. The administrative headquarters of the district is the town of Dharwad, also known as Dharwar.
What is Gondwana system?
Gondwana is a Southern Hemisphere supercontinent comprised principally of South America, Africa, Arabia, Madagascar, India, Antarctica, and Australia. From: Earth as an Evolving Planetary System (Second Edition), 2011.
What are Archean and Proterozoic eons?
The Archean Eon began about 4 billion years ago with the formation of Earth’s crust and extended to the start of the Proterozoic Eon 2.5 billion years ago; the latter is the second formal division of Precambrian time.
What happened during Archean?
The Archean Eon (4 to 2.5 billion years ago) During the Archean Eon, methane droplets in the air shrouded the young Earth in a global haze. There was no oxygen gas on Earth. Complex chemical reactions in the young oceans transformed carbon-containing molecules into simple, living cells that did not need oxygen to live.