Know It All Friday - 8th Science - 1/20

Differences in the moon's and sun's pull on different sides of the Earth cause _________.

• gravity
• lunar phases
• tides
• dabbing

What is a difference between spring and neap tides?

• Spring tides occur when the earth and sun are IN LINE with the new or full moon. 
• Spring tides occur when moon in 3rd or 1st quarter phases
• Spring tides are LOWER than neap tides
• Spring tides occur in Spring and neap tides can occur in any season

For every _______ there is an equal and opposite ________. 

• reaction, action
• action, action
• reaction, reaction
• action, reaction

A person would weigh less on on the Moon than on the Earth because . . .

• Moon has more mass, and therefore more gravity
• Moon has less mass, and therefore more gravity
• Moon has more mass, and therefore less gravity
• Moon has less mass and therefore less gravity

How is Earth's magnetic field similar to that of a magnet?

• It's shaped like a horseshoe.
• It has north and south poles.
• It is made plastic.
• It is hundreds of miles long.

How can the strength of an electromagnet be increased? (mark all that apply)

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil

Models of the solar system with Earth at the center are called _____________________ models.

• geocentric

• heliocentric

• terrestrial

• none of the above

Tides are caused by

• strong winds that blow over ocean waters.
• the interaction of Earth, the moon and the sun.
• the shifting of the plates on the ocean floor.
• variations in the salinity of ocean water

Earth and the other planets closest to the Sun are made mostly of _______

• gas
• metal
• water
• rock

Which is the largest object in our solar system?

• Sun
• Jupiter
• Earth
• Pluto