stest

Nuclear fusion

Process in the sun's core where hydrogen atoms collide, fuse, and form helium, releasing massive energy due to extreme conditions.

Sunspot

Darker area on the sun's surface caused by cooler temperatures compared to surrounding areas.

Core

Hottest central part of the sun.

Radiative Zone

Largest sun region where energy is transferred to the surface through conduction and radiation diffusion.

Photosphere

Sun's outer shell emitting visible light.

Chromosphere

Sun's hot atmosphere.

Atomic number

Number of protons or electrons in an atom.

Atomic mass

Sum of protons and neutrons in an atom.

Atoms

Basic units of matter with no overall charge.

Elements

Pure substances with only one type of atom.

Compounds

Substances with chemically bonded different types of atoms.

Mixtures

Substances with mixed but not chemically bound components.

Molecules

At least two atoms chemically bonded.

Ions

Atoms or groups with an electric charge.

Ionic compounds

Atoms bonding to form ions for a full valence shell.

Atmosphere

Earth's gaseous envelope mainly composed of nitrogen, oxygen, and water vapor.

Troposphere

Lowest atmospheric layer with decreasing temperature at higher altitudes.

Stratosphere

Atmospheric layer with increasing temperature at higher altitudes and the ozone layer.

Mesosphere

Atmospheric layer with decreasing temperature at higher altitudes.

Thermosphere

Atmospheric layer with increasing temperature at higher altitudes, absorbing heat from UV rays.

Exosphere

Outermost atmospheric layer allowing particles to escape.