1. What causes the tides? Tides are caused by the gravitational interaction between the Earth and the Moon. The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side). Since the earth is rotating while this is happening, two tides occur each day.
2. What is animal adaptation and why is it important to animal survival? Animals come in all shapes and sizes, and they live in all kinds of environments. An environment is everything that surrounds and affects how an animal lives. All animals have adaptations that fit their environments. An adaptation is a part of an animal's body or way that an animal behaves that helps it survive.
3. What is a symbiotic relationship? A situation in which plants or animals of different species live together in a mutually advantageous relationship
4. What is density? Density is a mass of a given volume of a substance.
5. What are the main causes of currents in the oceans? Surface ocean currents are mainly wind-driven and occur in all of the world's oceans.
6. What is sea floor spreading? A process by which new sea floor is formed as it moves away from spreading centers in mid-ocean ridges.
7. What is biological evolution? Is that all life on Earth shares a common ancestor, just as you and your cousins share a common grandmother.
8. How do scientists classify animals? Scientists classify animals by looking at their similarities and differences.
9. What is the scientific method and what are the steps? First of all, you should name the problem or question. Secondly, you should form an educated guess or hypothesis of the cause of the problem and predictions based upon the hypothesis. Thirdly, you should test your hypothesis by doing an experiment or study (trail and error). Finally, you should check and interpret your results.
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