March 2, 2015

Homework Help: Science

Posted by Mandy on Tuesday, January 21, 2014 at 12:12pm.

Can someone please please help me? I don't have a text book, i have a online book and it isn't working. Can someone please be nice and help me? Science isn't my subject!
1. Why is Earth’s temperature just right for life? (1 point)
Earth’s core is hot enough to heat Earth’s surface.
Earth’s magnetic field creates suitable temperatures on Earth’s surface.
Earth’s crust is warmed by heat from the sun.
Earth’s atmosphere traps heat from the sun, which makes Earth’s temperature suitable for living things.
2. Which of the following statements accurately explains how Earth’s atmosphere supports life? (1 point)
Earth’s atmosphere contains 78 percent oxygen, which is essential for life.
Earth’s atmosphere contains 21 percent oxygen, which many life forms need to survive.
Earth’s atmosphere contains more oxygen than carbon dioxide.
Earth’s atmosphere contains carbon dioxide, which all life forms breathe in.
3. What is the relationship between Earth’s surface features and Earth being called the “blue planet”? (1 point)
Clouds in Earth’s atmosphere can sometimes appear blue when viewed from space.
Water on Earth’s surface appears blue when viewed from space.
The sky is actually blue.
Oxygen in Earth’s atmosphere appears blue when viewed from space.
4. Which of the following statements best explains why Earth’s place in space is suitable for life? (1 point)
Earth is the smallest of the outer planets, making its temperature just right for life forms.
Earth is the third planet from the sun, and its distance from the sun is just right.
Earth is the second planet from the sun and is a medium-sized inner planet.
Earth is the largest and innermost planet in the solar system; the sun keeps Earth’s temperature warm.

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