Captivity is the state of being held captive. The birds in the cage in the picture are living in captivity.
Carson City is the capital of the state of Nevada in the United States of America. It has a population of around 55,000.
A city is a place where there is a very large number of buildings and houses close together. A city may have many millions of people living in it. The city in the picture is in Japan, and is called Tokyo.
A deity is a divine creature that is worshipped as part of a religion. Deities are usually ascribed special powers.
If you have two things that are the same size, and one weighs a lot more than the other, the heavy thing is more dense. The sponge on the left in the picture is much, much lighter than the brick in the picture, but they are around the same size. The sponge has a lower density than the brick.
Electricity is the flow of charged particles through a conducting material, usually copper. Electricity is used for a huge variety of things today, with virtually all modern devices powered by it. Electricity is used to make many common things around you work, such as your refrigerator, modern watches, computers and phones. Electricity can be stored inside a battery to be used later. You may also be interested in static electricity or lightning, two other effects of electricity.
Gravity is a force that pulls things with mass together. For most people, this simply means that anything you lift away from the surface of the Earth will fall down again when you let it go.
Guatemala de la Asunción, or Guatemala City, is the capital of Guatemala. It has a population of around 4.1 million.
Humidity is a measure of how much water is in the air. It is often very humid when it is hot, and it has been raining. Tropical parts of the world are humid.
Jefferson City is the capital of the state of Missouri in the United States of America. It has a population of around 150,000.