Definition: A layer of soil that remains frozen all year round, found mainly in very cold regions like the Arctic.

Example: The construction of the building was delayed due to the presence of permafrost beneath the site.

Definition: The ability of a material to allow liquids or gases to pass through it.

Example: The permeability of the soil affects how quickly water drains away.

Definition: Able to allow liquids or gases to pass through it.

Example: The permeable material allowed water to flow through easily.

Definition: Having a tendency to spread throughout an area or a group of people.

Example: The pervasive influence of social media can be seen in many aspects of daily life.

Definition: Able to allow things to pass through, such as water or air; not blocked or closed off.

Example: The soil in this area is pervious, allowing rainwater to seep into the ground easily.

Definition: The quality of allowing liquids or gases to pass through it.

Example: The perviousness of the soil allows rainwater to seep into the ground.

Definition: A harmful plant or animal that causes damage or annoyance, especially to crops or livestock.

Example: The farmer used pesticides to control the pests in his fields.

Definition: Relating to substances that are used to kill pests, especially insects or weeds.

Example: Farmers often use pesticidal sprays to protect their crops from harmful insects.

Definition: A chemical substance that is used to kill unwanted animals or plants, especially insects that harm crops.

Example: Farmers often use pesticide to protect their crops from insects.

Definition: Causing annoyance or harm, often related to disease or moral corruption.

Example: The pestiferous weeds spread quickly and choked the life out of the garden.