Planet Earth

Match the subatomic particles

• electron

• Electrons

• protons

• Negatively charged

• Orbit the nucleus.

• Particles with no charge

• neutrons

• Found in the nucleus

• protons and neutrons

• Positively charged particles

An atom that gains or loses an electron is called

• an ion.

• an isotope.

An atom that contains more or less neutrons than is normal is called

• an ion.

• an isotope.

The ____________________ is an imaginary line that divides the Earth at the center between north and south.

• hemisphere

• equator

• Tropic of Cancer

• Tropic of Capricorn

The _____________ and ____________ separate the earth into the Eastern and Western hemispheres.

• International Date Line

• Tropic of Cancer

• The Prime Meridian

• Tropic of Capricorn

What was the name of the Greek mathematician who measured the earth's circumference over 2200 years ago?

• Eratosthenes

• Kepler

• Copernicus

• Galileo

What causes the Earth's magnetic field?

• Flow of molten iron in the earth's cores

• Cosmic rays

• Flow of molten aluminum

• Volcano eruption

Without Earth’s magnetic field

• Compasses would not work.

• Solar winds would strip away ozone from the atmosphere.

• Life would be exposed to ultraviolet radiation.

• Earth's rotation would stop.

Earth's magnetic field is lined up precisely with respect to the poles.

• 1. TRUE

• 1. FALSE

What is the name for the imaginary line that runs through the center of the Earth from the North to the South Pole?

• Geographic Pole

• Magnetic Pole

• Axis

• Equator