Which one of the following is the oldest era in Geological History determining the age of various rock types?

Which one of the following is a type of igneous rock?

Which one of the following is not an igneous rock ?

Which of the following rock systems in India is the latest one?

Which of the following geological systems of rocks contain a rich reserve of iron ore in India?

Which one of the following rock systems in India is the main source of coal deposits?