Unit 15 Lesson 8 What are Tides?

What are tides?

• The rising and falling of Earth's ocean surface

• Waves caused by wind

• Currents flowing in the ocean

• Storm surges during hurricanes

What causes tides?

• The wind blowing across the ocean

• The rotation of the Earth

• The gravitational pull of the moon and sun

• The temperature of the water

Tags

NGSS.MS-PS2-4

What is high tide?

• A period of high water levels

• A time when the ocean is calm

• A period of low water levels

• A time when the ocean is stormy

How do tides affect the Earth's surface?

• They cause earthquakes

• They have no effect on the Earth's surface

• They create mountains

• They alter the surface by changing water levels

Tags

NGSS.HS-ESS2-5

Which activity is the easiest to do during high tides?

• Fishing

• Surfing

• Diving

• Sailing

What are Spring tides?

• tides that are weaker than usual

• tides that occur during the spring

• tides that are higher and lower than usual

• tides that only occur once a month

Tags

NGSS.MS-ESS1-1

When do neap tides occur?

• during a full moon

• during a new moon

• when the Sun and Moon are at a 90 degree angle to the Earth

• when the moon is closest to Earth

Tags

NGSS.MS-ESS1-1

How often do tides occur each day?

• 3 times a day

• 2 times a day

• 1 time a day

• 4 times a day

Why do tides not occur at the same time every day?

• because the Earth rotates faster than 24 hours

• because the moon changes its shape

• because the Earth takes a little longer than 24 hours to rotate

• because the sun changes its position

What happens to tides when the Moon is closer to the Earth?

• tides become weaker

• tides stop occuring

• tides only occur once a day

• tides become stronger

Tags

NGSS.HS-PS2-4