SCIENCE 7B LESSON

the process by which plants make food: plants convert carbon dioxide and water to oxygen and glucose

A mixture of gases that surround a planet, moon, or other space object

the energy absorbed and reradiated by the atmospheric gases through the greenhouse effect.

One type of solar radiation that can harm life is ultraviolet. This is harmful because it can damage the genetic material of an organism.

earth has a protective ozone layer that blocks most ultraviolet radiation before it reaches Earth’s surface. This ozone layer contains ozone gas in addition to other atmospheric gases.

is the path that a body follows as it travels around another body in space. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune orbit the Sun

a collection of large and small bodies that orbit the central star

is the force of attraction between objects due to their masses and the distances between them.

the process of setting a rocket or spacecraft in motion. Gas, often burning fuel, is used to launch a rocket

a reusable spacecraft glides to a landing like an airplane

is a crewed or uncrewed space vehicle that is designed to be placed in orbit around Earth or on a path in space.

a steep angle causes the craft to be overheated, a shallow angle will cause it to bounce back off the atmosphere into space

the minimum velocity and object in order to go in orbit around earth or another object

a belt of relatively small objects

is the apparent loss of weight of an object that is falling freely due to gravity

radiation in space includes electromagnetic radiation and highly charged particles that can damage DNA and tissues. This cause the risk of cancer.

include small particles of dust or rock that are moving at high speeds in space, they can cause serious damage if they collide with a spacecraft or an astronaut working outside the spacecraft.

Oxygen is supplied in the spacecraft, 80% is nitrogen and 20% is oxygen. The crew only wear spacesuits when outside of the spacecraft.

The carbon dioxide that is exhaled must be removed from the spacecraft. The garbage that is produced is stored until landing. The toilets are designed to collect liquid and solid in a weightless environment, liquid is recycled and waste is compressed and stored.

Most food is freeze-dried, and water is added. Food must be quick to open and serve. Drinking is done with straws or zero-gravity cups.

Air and water.