Q. The longest era of the classification of the history of earth is

? Pre-Cambrian era

Q. The minimum values of annual receipts of solar radiation occur at

? The arctic

Q. The rock formations that cannot store groundwater are called

? Aquicludes

Q. The planet that takes the highest time for completing a rotation is

? Venus

Q. The river situated along the border between the USA and Mexico is

? The Rio Grande

Q. The oldest rocks found in ocean basins are ____ than the oldest continental rocks.

? Younger

Q. The R-horizon of soil horizon consists of

? Unweathered Bedrock

Q. The propagation of radio signals is greatly influence by

? Ionosphere

Q. The planets with no natural satellites (reported so far) are

? Mercury and Venus

Q. The plants of which of the following crops are highly sensitive to frost ?

? Cotton

Q. The religion of Afghanistan is

? Islam

Q. The reaction between compounds and oxygen is called

? Oxidation