A cloud, often large and heavily dense.

To form a mental image or concept of something that is not present to the senses or has never before been wholly perceived in reality.

The compartment in an aircraft or spacecraft where the pilot sits to control the vehicle.

The moment or process when an aircraft leaves the ground and begins to fly.

The quality of being correct, precise, or exact in a measurement or statement.

To find an approximate value or number for something, rather than finding the exact amount through counting or measuring.

To start a computer system again, usually to fix a problem or because of a software update.

Feeling worried, nervous, or uneasy about something with an uncertain outcome.

A sudden sensation of fear or anxiety that is so strong it prevents a person from thinking clearly or acting reasonably.

A mistake or a condition of being wrong in conduct, judgment, or calculation.

A sudden signal, such as a loud noise or a flashing light, that warns people of danger or tells them it is time to wake up.

An area of land or a surface that is covered with a lot of green plants with narrow leaves.