PRAXIS Elementary Education: Science Content Knowledge 3

Question 1

Which layer of Earth is composed mostly of liquid iron and nickel?

Accepted Answer

Outer core

Answer

The outer core is liquid iron and nickel and generates Earth's magnetic field.

Question 2

The Moon appears to change shape over a month because of what?

Accepted Answer

The angle of sunlight we see reflected

Answer

Moon phases result from the changing portion of the sunlit Moon visible from Earth.

Question 3

Which simple machine is a doorknob an example of?

Accepted Answer

Wheel and axle

Answer

A doorknob is a wheel and axle that turns to move a latch.

Question 4

What is the primary gas that plants take in for photosynthesis?

Accepted Answer

Carbon dioxide

Answer

Plants absorb carbon dioxide and release oxygen during photosynthesis.

Question 5

An animal with a backbone is classified as which of the following?

Accepted Answer

Vertebrate

Answer

Vertebrates are animals that possess an internal backbone or spine.

PRAXIS Practice Test