1. The Moon’s and Sun’s Effect on Earth
Ocean Tides
Electromagnetic Radiation

2. Ocean Tides The periodic rise and fall of the water level of the ocean
High tide – flood
Low tide – ebb
Difference between high tide and low tide – tidal range
The average water level (between tides) – sea level

3. The Cause of Ocean Tides
Gravitational pull from the Moon and Sun
Amount of gravity is determined by the size of the object
Sun has more gravity, but the Moon has more influence on Earth because of the distance
Cycles every 24 hours and 50 minutes
Most high tides occur every 12 hours and 25 minutes
Low tides occur 6 hours and minutes after the high tide
Frequency depends on your position on Earth

4. Spring vs. Neap Tides (High Tides Only)
Spring Tides
When the Moon and Sun align with Earth in a straight line
Very high
Neap Tides
When the Moon and Sun create a right angle with Earth
Lower than Spring Tide but higher than sea level
Low tides occur in the area opposite of high tides

5. The Sun’s Electromagnetic Radiation
The Sun produces energy through nuclear fusion
2 Hydrogen Atoms combine to form 1 Helium Atom
Radiates energy in all directions
Will be able to produce energy for the next 3 billion years

6. Detection of Solar Radiation
Eyes detect visible light energy
Skin detects infrared energy through heat
Ears detect radio waves (through electronic devices like TV, radios, phones, etc.)
Ultraviolet waves cause skin (humans and other animals) to tan (produces Vitamin D) and can lead to skin cancer