Patricia Armentrout Books

Hot springs and geysers

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Explores the nature, location, and causes of hot springs, including those that gush hot water and steam into the air and are called geysers.

Lights in the sky

By Patricia Armentrout

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Describes various kinds of lights seen in the sky including rainbows, lightning, and the aurora borealis.

The ozone layer

By Patricia Armentrout

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Describes the ozone layer, explains how it is broken down, and suggests ways to reduce air pollution.

Waves and tides

By Patricia Armentrout

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Discusses the causes of ocean waves and tides and their effects on both people and the earth.

The inclined plane

By Patricia Armentrout

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Text and pictures introduce the inclined plane, a simple machine consisting of a slanted surface or ramp to make work easier.

The lever

By Patricia Armentrout

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Text and pictures introduce the lever, a simple machine used to change force and motion.

The pulley

By Patricia Armentrout

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Text and pictures introduce the pulley, a simple machine used primarily to lift heavy objects.

The screw

By Patricia Armentrout

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Text and pictures introduce the screw, a simple machine used primarily as a fastening device.

The wheel

By Patricia Armentrout

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Text and pictures introduce the wheel, a simple machine used primarily to make it easy to move heavy loads.

The wedge

By Patricia Armentrout

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Text and pictures introduce the wedge, a simple machine placed between objects to split, tighten, or secure a hold.

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.