The modified Mercalli (MM) intensity scale is composed of 12 increasing levels of intensity that range from imperceptible shaking to catastrophic destruction and is designated by Roman numerals I through XII. Although qualitative in nature, it can provide a more concrete model for middle and high school students striving to understand the dynamics…

The Earth is a powerful, active, and ever-changing planet. Earthquakes and volcanoes reshape the Earth's crust with sudden bursts of movement or with eruptions that last decades. Powerful storms develop in the swirling atmosphere, creating cumulonimbus thunderclouds, lightning storms, and even tornadoes or hurricanes. Geological features and moist…