| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.91 |
| Score | 0% | 58% |
Which of Earth's layers has weather?
thermosphere |
|
mesosphere |
|
stratosphere |
|
troposphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.
Tough fibrous cords of connective tissue that connect muscles to the skeleton are called:
vertebra |
|
cartilage |
|
tendons |
|
ligaments |
Tough fibrous cords of connective tissue called tendons connect muscles to the skeleton while another type of connective tissue called ligaments connect bones to other bones at joints (elbow, knee, fingers, spinal column).
Which of the following is not a characteristic of the Sun?
formed 2.6 billion years ago |
|
is a yellow dwarf star |
|
is composed of hydrogen and helium |
|
makes up over 99% of the mass of the solar system |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
In the food chain, omnivores may be which of the following?
primary or secondary consumers |
|
secondary consumers or scavengers |
|
primary or tertiary consumers |
|
secondary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
Which of the following describes the Earth's mantle?
liquid |
|
primarily solid |
|
primarily liquid |
|
solid |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.