Definition: A stream that is the starting point or source of a river.

Example: The headstream of the river flows down from the mountains.

Definition: The place where a river or stream begins, often in the mountains or hills.

Example: The hikers followed the trail to the headwater of the river, where the water flowed gently from the rocks.

Definition: An area of land covered with low shrubs and plants, typically found in dry and sandy places.

Example: The heathland was filled with colorful wildflowers and buzzing insects.

Definition: Not producing or using heat.

Example: The heatless light bulbs are more energy-efficient than traditional ones.

Definition: A unit of area measurement that is equal to 10,000 square meters, commonly used in land measurement.

Example: The farmer owns 50 hectares of land for growing crops.

Definition: A unit of area equal to 10,000 square meters, commonly used in measuring land.

Example: The farmer owns fifty hektare of land for growing crops.

Definition: A chemical substance that was used as a pesticide and is known to be very harmful to humans and animals, often appearing as a white or tan powder.

Example: Heptachlor was banned in many countries due to its dangerous effects on health and the environment.

Definition: Relating to substances that can kill or harm plants, particularly weeds.

Example: Farmers often use herbicidal sprays to control unwanted vegetation in their fields.

Definition: A chemical that is used to kill unwanted plants, especially weeds.

Example: Farmers often use herbicide to keep their fields free of weeds.

Definition: A small raised area of land, often smaller than a hill.

Example: The children played on the hillock near the river.