Hansen, Amy

An illustrated description of insects, and where they go during the winter months.

An introduction to hydropower that defines what it is, describes how it is made, and discusses how it is used and its negative effects on the planet.

Presents an introduction to the concepts of sinking and floating, in simple text with illustrations, explaining how density and shape impact whether an object will sink or float.

This book is an introduction to nuclear energy, the breaking of uranium atoms apart to generate electricity, and explains that there are advantages and disadvantages to using nuclear power.

Photographs and explanatory text describe how various things work, including airplanes, televisions, escalators, and bridges.

Intermediate readers investigate what happens when objects experience different conditions (ie. hot/cold, wet/dry).

Introduces the three states of water and explains how it changes as the molecules that make it up respond to changes in temperature and air dryness.

An introduction to fossil fuels that defines what they are, describes where they are found, and discusses how they are used and their negative effects on the planet.

Learn about the sources, harnessing, and workings of geothermal energy, and what the future holds for this reliable, renewable energy source.

This book is an introduction to wind energy, the energy of moving air, and explains that it is a renewable energy and that new designs of turbines can make electricity from lighter wind.