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Listen to Book 6: The Ocean Expedition

All 150 answers from Book 6, read aloud. Press play and keep listening, or tap a question to jump to it. Each title links to its page with the video and the full answer.

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1.Why Is the Ocean Salty?
2.Why Are There Waves?
3.Why Do Tides Go in and Out?
4.Why Is the Ocean Blue?
5.Why Does the Shore Keep Changing?
6.Why Does Foam Show Up on Waves?
7.Why Can the Water Pull You Out?
8.Why Do Tide Pools Appear?
9.Why Is Some Sand Wet Under the Dry Top?
10.Why Is Beach Sand Often Tiny?
11.Why Do Seashells Wash Up?
12.Why Does Seaweed Pile on the Beach?
13.Why Does the Ocean Smell Like That?
14.Why Do Some Beaches Have Pebbles?
15.Why Do Waves Get Bigger Near Shore?
16.Why Is There a Line of Junk on the Sand?
17.Why Is Some Sand Black?
18.Why Does Wet Sand Hold a Castle?
19.Why Do Footprints Fill with Water?
20.Why Does Salt Help You Float?
21.Why Is the Ocean Colder than a Puddle?
22.Why Do Rocks Get Holes By the Sea?
23.Why Does Spray Feel Colder than the Air?
24.Why Is the Horizon a Straight Line?
25.Why Do Birds Follow the Tide Line?
26.Why Do Fish Have Gills?
27.Why Don't Fish Drown?
28.Why Do Fish Have Scales?
29.Why Do Some Fish Swim in Schools?
30.Why Are Fish Slippery?
31.Why Can Some Fish Glow?
32.Why Is a Flounder So Flat?
33.Why Does a Seahorse Look Like a Horse?
34.Why Does an Octopus Have Three Hearts?
35.Why Can an Octopus Change Color?
36.Why Do Crabs Walk Sideways?
37.Why Does a Hermit Crab Wear a Shell?
38.Why Does a Starfish Have Five Arms?
39.Why Can a Starfish Grow an Arm Back?
40.Why Do Jellyfish Sting?
41.Why Isn't a Jellyfish a Fish?
42.Why Do Some Clams Make Pearls?
43.Why Do Some Fish Have Whiskers?
44.Why Do Flying Fish Jump?
45.Why Does an Eel Look Like a Snake?
46.Why Does a Pufferfish Puff Up?
47.Why Do Some Fish Live in the Dark?
48.Why Doesn't an Anemone Sting a Clownfish?
49.Why Do Shrimp Dart Backward?
50.Why Do Barnacles Stick So Hard?
51.Why Do Whales Breathe Air?
52.Why Do Whales Have a Blowhole?
53.Why Do Some Whales Sing?
54.Why Do Whales Travel So Far?
55.Why Is a Blue Whale So Huge?
56.Why Do Some Whales Have Baleen Instead of Teeth?
57.Why Do Dolphins Click?
58.Why Do Dolphins Ride a Boat's Wave?
59.Why Do Sharks Have So Many Teeth?
60.Why Do Many Sharks Keep Swimming?
61.Why Do Some Sharks Look Like Carpets?
62.Why Is a Great White Pale Underneath?
63.Why Don't Most Sharks Hunt People?
64.Why Does a Hammerhead Have a Hammer?
65.Why Can a Shark Smell a Tiny Bit of Blood?
66.Why Is a Ray So Flat?
67.Why Does a Manta Look Like It Is Flying?
68.Why Is a Whale Shark Not a Whale?
69.Why Do Orcas Hunt Together?
70.Why Do Seals Climb Onto Rocks?
71.Why Do Sea Turtles Come Back to a Beach?
72.Why Is a Giant Squid So Hard to See?
73.Why Do Whales Have Blubber?
74.Why Do Whales Leap Out of the Water?
75.Why Is a Manatee Called a Sea Cow?
76.Why Is Coral an Animal, Not a Rock?
77.Why Do Corals Need Sunlight?
78.Why Do Reefs Look Like Cities?
79.Why Do Corals Bleach?
80.Why Can't You Stand on Coral?
81.Why Is a Kelp Forest So Tall?
82.Why Does Kelp Have Floats?
83.Why Do Otters Help Kelp?
84.Why Is Plankton So Important?
85.Why Does the Sea Sometimes Glow at Night?
86.Why Do Some Algae Make the Water Green?
87.Why Do Sponges Have Holes?
88.Why Do Anemones Look Like Flowers?
89.Why Do Parrotfish Poop Sand?
90.Why Do Cleaner Fish Pick at Bigger Fish?
91.Why Do Mangroves Grow in Salt Water?
92.Why Are Seagrass Beds Called Nurseries?
93.Why Do Some Reefs Grow in Rings?
94.Why Is a Lagoon Calmer than the Open Sea?
95.Why Do Some Snails Have Bright Colors on a Reef?
96.Why Do Christmas-Tree Worms Vanish?
97.Why Do Some Corals Come Out at Night?
98.Why Is the Water Around a Reef So Clear?
99.Why Do Scientists Plant Coral?
100.Why Does a Tiny Change in Heat Hurt a Whole Reef?
101.Why Do Ships Float?
102.Why Is a Keel on the Bottom of a Boat?
103.Why Do Big Ships Have Such Small-Looking Propellers?
104.Why Does a Lighthouse Flash?
105.Why Did Sailors Use Stars to Find Their Way?
106.Why Is a Compass Needle Twitchy on a Ship?
107.Why Are There Lines on a Nautical Chart?
108.Why Do We Use Latitude and Longitude?
109.Why Is the International Date Line in the Pacific?
110.Why Does a Submarine Go Up and Down?
111.Why Do Submarines Make So Little Wake on the Surface?
112.Why Do Scientists Use Sonar?
113.Why Is the Seafloor Mapped in Strips?
114.Why Do Research Ships Drag Nets and Bottles?
115.Why Is a Weather Buoy Left Alone in the Ocean?
116.Why Do Satellites Watch the Sea From Space?
117.Why Is There a Dead Zone in Some Coastal Water?
118.Why Do Currents Move Like Rivers in the Sea?
119.Why Is the Gulf Stream Famous?
120.Why Do Containers Stack So High on a Ship?
121.Why Do Harbors Need Pilots?
122.Why Do Some Boats Have Two Hulls?
123.Why Does a Life Jacket Work?
124.Why Do Divers Need Tanks?
125.Why Is the Deep Ocean So Hard to Visit?
126.Why Do Hurricanes Grow Over Warm Ocean Water?
127.Why Does a Storm Surge Flood a Coast?
128.Why Do Sea Walls Sometimes Make Beaches Worse?
129.Why Do Wetlands Protect Towns From Storms?
130.Why Is Plastic in the Ocean a Problem?
131.Why Do Helpers Cut Six-Pack Rings?
132.Why Do Sea Turtles Eat Bags?
133.Why Is Oil in Water So Hard to Clean?
134.Why Do Beaches Need a Cleanup Day?
135.Why Do Some Sunscreens Hurt Reefs?
136.Why Do We Measure the Ocean's Temperature?
137.Why Is Sea Level Rising?
138.Why Do Ice Sheets Matter to a Beach Far Away?
139.Why Does Extra Carbon Dioxide Change Seawater?
140.Why Do Scientists Tag Fish and Turtles?
141.Why Is a Marine Park a Kind of Fence?
142.Why Do Fishers Use Limits and Seasons?
143.Why Should You Put a Shell Back If a Creature Is Inside?
144.Why Is Dumping Aquarium Fish in the Sea a Bad Idea?
145.Why Do Ships Have Rules About Ballast Water?
146.Why Do Some Coasts Restore Dunes?
147.Why Should a Tide-Pool Visit Be Look, Don't Poke?
148.Why Does Turning Off Extra Lights Help Hatchling Turtles?
149.Why Do Kids' Small Habits Still Matter for the Ocean?
150.Why Is the Ocean Worth a Whole Expedition?

The audio is the sound from each video, so it includes soft background music.

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