Our noses have thousands of nerves that connect up to our brain.
Viruses are much smaller than bacteria. The glass can be snapped along the line of the scratch. The air next to this air also shakes and the shaking continues just like a string of people in a line passing on a message to each other.
Continental drift happens really slowly and continents move at about the same rate as your finger nails grow. Lots of things are made from plastic or polymers. If lightning is far away, it can take many seconds to hear the thunder. Gears are used on bicycles and cars so that the engine can give the wheels a lot of torque to get the bicycle or car moving easier from a standstill. This shakes the air all around it. Gasoline and the metal mercury are examples of liquids and rock, wood, glass and plastic are all solids. You may have seen these words on the packaging of food.
We also use them in motors, electric generators for making electricity and MRI scanners for seeing inside our bodies.
The number pi can be used to find the circumference of a circle. So the chemical name for water is H2O. An oil level sensor in an engine senses if the lubricating oil level is too low. Pressure is the intensity of a force or how concentrated a force is in a particular area. Plants need heat to grow and seeds need heat to germinate.
A light year is the distance light travels in a year. Over millions of years, the enormous weight and pressure squeezed all the stuff together to make rock. Much smaller particles called electrons orbit the nucleus.
This means that electricity can't pass through it. Computers were once huge machines that took up a large room and had to be programmed by plugging in wires. When you put a spoon into hot coffee, the handle eventually gets hot. Mass is like weight, but while mass stays the same, weight changes depending on what planet you are on. A laptop computer is thousands of times more powerful than these first computers. This is often used for making hollow things like plastic toys and plastic plumbing fittings for connecting pipes. In the kitchen we pour Jell-o (jelly) into a mold and when it sets, it's shaped like the mold.
The needle of a compass is a magnet and always points to the North Pole.
For instance the rate at which water empties from a container slows down as the water level drops and also if the temperature of the water changes on hot days. These include polythene, polystyrene, polyester, PVC, polycarbonate, polyurethane and polypropylene. When something is in motion, this means it is moving. This new wonder material was called steel. The harder you pull, the harder the spring pulls back. The continents form the outer skin of the Earth called the crust that extends to about 40 miles (65 km) deep. A cube of water with sides one metre long, weighs one metric tonne. It is approximately 238,000 miles or 384,000 km from our planet Earth. First it sucks a mixture of air and gasoline into the cylinder.