Warm-up: 5 minutes

Answer in complete sentences.

1.How would you describe ocean tides to a friend?

2.Where do you think the sun’s energy comes from?

Warm up 1st Block- 10 minutes

Get out yesterday’s Bill Nye Worksheet (some of you handed it in and it’s graded, it’s in a stack at your tables)

Answer the sets of questions about Earth’s motions and seasons that’s on the back.

Today’s Objectives

1) Explain that the tidal impact is due to the gravitational interaction between the Earth and the moon.

2) Explain how the sun produces energy which is transferred to the Earth by radiation

3) Explain how solar energy makes life possible on Earth

Agenda

• Warm-up

• Guided reading worksheet: Tides

• Tides video

• Guided reading worksheet: Sun

• Sun video

Tides reviewTides reviewThere are 2 kinds of regular There are 2 kinds of regular tides: high and low tide.tides: high and low tide.

Tidal range: difference in height between Tidal range: difference in height between successive high and low tidessuccessive high and low tides

What causes tides?

Gravitational interaction between the Earth and the moon.

.

Solar Energy Review

• The sun is 1 of 100 billion stars in the Milky Way Galaxy

Electromagnetic spectrum

Electromagnetic spectrum- the arrangement of energy waves according to their wavelengths and frequencies

Doppler effectThe doppler effect is

the change in wavelength of a wave that is emitted from a source that is moving away or toward an object

Doppler effect

Red shifts- when objects are moving away

Blue shifts- when objects are moving towards something

Nuclear Fusion• The sun shines because it produces energy

by nuclear fusion• In the nuclear reaction, smaller atoms are

fused together to make a larger one• Lots of energy is released from nuclear

fusion• E = mc2

– E= energy

– M = mass

– C= speed of light

Nuclear Fission• The sun also produces

energy by nuclear fission.

• Nuclear fission is the splitting of large atoms into smaller ones

• The energy released from fission is less than that released from nuclear fusion

Is everything that the sun sends to Earth good?

• Nope!

• The Sun emits or sends harmful radiation particles that would be bad for all living things on earth.

• Radiation is the transfer of energy through space by electromagnetic waves

• High energy particle radiation that could endanger life on Earth is forced to drift around the Earth within two large donut-shaped regions called radiation belts. Invisible magnetic fields are the reason that particle radiation moves in this way.

• The magnetic fields repel the particles

Why are plants important? How does the sun make plants grow?

What? PHOTOSYNTHESIS is a chemical reaction that uses the sun energy to produce oxygen and sugar, two things that we need!

Where?

Why? The purpose is to _____________ _____________!!!

How? Uses _______, _______, and ____________________ to make _____________ and ______________

Who? Organisms that can produce their own food: ______________

This occurs in the leaves of plants

make sugar

watersunlight carbon dioxideoxygen sugar

producers

Todays’s Exit Ticket: 10 minutesDirections: Answer in complete sentences.

1.What is the difference between nuclear fusion and nuclear fission?

2.Why are nuclear reactions on the sun important for us on Earth?

3.What causes tides on Earth?

4.What is the main difference between spring tides and neap tides?

Answers to Exit Ticket

1. Nuclear fusion is the combining of smaller hydrogen atoms to make a larger helium atom. Nuclear fusion is the splitting of a larger atom into smaller atoms.

2. Nuclear reactions on the sun provide us with sunlight, which is important for photosynthesis. Photosynthesis is important for us because it makes oxygen and sugar, which we use.

Answers to Exit Ticket

3. The gravitational interaction between the Earth and moon causes tides.

4. The tidal range between spring tides is higher than the tidal range between neap tides.