Earth’s major systems are the geosphere (solid and molten rock, soil, and sediments), the hy- drosphere (water and ice), the atmosphere (air), and the biosphere (living things, including humans). Within these systems, the location of Earth’s land and water can be described. Also, these systems interact in multiple ways. Weathering and erosion are examples of interactions between Earth’s systems. Some interactions cause landslides, earthquakes, and volcanic erup- tions that impact humans and other organisms. Humans cannot eliminate natural hazards, but solutions can be designed to reduce their impact.