The oldest form of cultivation in Sri Lanka is known as
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Who made the first chocolate bar?
Malachite is an ore/mineral of
An _______________ is a sudden shaking or trembling of the earth.
The method of soil conservation in which different crops are grown in alternate rows and are sown at different times to protect the soil from rain wash is called?
The salt concentration (measured as salinity in parts per thousand), is less than ______ % in inland waters.
India is developing Chabahar Port in which of the following countries?
Tricare formerly known as Champus is funded through