GED Science Earth and Space Science 4

Question 1

The Hertzsprung-Russell diagram plots stars according to their luminosity and:

Accepted Answer

Surface temperature

Answer

The H-R diagram plots stellar luminosity (brightness) on the vertical axis against surface temperature (or spectral class) on the horizontal axis, revealing patterns in stellar evolution.

Question 2

Which of the following best describes the rock cycle?

Accepted Answer

The continuous transformation of rocks from one type to another through geological processes

Answer

The rock cycle describes how igneous, sedimentary, and metamorphic rocks are continuously converted from one type to another through melting, cooling, erosion, and pressure.

Question 3

What is the main difference between weather and climate?

Accepted Answer

Weather describes short-term atmospheric conditions; climate describes long-term patterns

Answer

Weather refers to day-to-day atmospheric conditions like temperature and precipitation, while climate describes the average patterns over 30 or more years for a region.

Question 4

A region that receives less than 25 cm (10 inches) of precipitation per year and has sparse vegetation is classified as a:

Accepted Answer

Desert biome

Answer

Deserts are defined by extremely low annual precipitation (under 25 cm), which severely limits plant and animal life, regardless of temperature.

Question 5

Which force is primarily responsible for holding stars together against the outward pressure of nuclear fusion?

Accepted Answer

Gravity

Answer

Gravity pulling the star's mass inward balances the outward radiation pressure from nuclear fusion, maintaining a star's stable size during its main-sequence lifetime.

GED Practice Test

GED Practice Test

GED Science Earth and Space Science 4