Fact 1: Chemical weathering causes iron in rock to oxidize. Fact 2: Rust colored residues are due to oxidized iron. Given the two facts above, answer the question "What causes rust?" with the following options: - a pathogens - Roundworms - flow of electrons - dust - thunder - an amoebae - chemical weathering - skin
chemical weathering

Fact 1: Extreme heat and pressure change rock into metamorphic rock. Fact 2: Sedimentary rock changes into a different form when it undergoes heat, pressure or other forces. Given the two facts above, answer the question "What makes sedimentary rock turn into metamorphic?" with the following options: - crust - erosion - thrust - wind - two - coal - calcite - Force
Force

Fact 1: Electricity sometimes is used for heating buildings. Fact 2: Most electricity is created with a turbine generator. Given the two facts above, answer the question "What are most buildings heated with?" with the following options: - a hydraulic system - electromagnetic energy - compound of hydrogen oxygen - Movement of an air mass - cellulose - turbine generators - lowered energy cost - direct energy
turbine generators

Fact 1: Mammals can also generate little bursts of heat by shivering. Fact 2: Shivering costs the bird, however, by depleting energy stores. Given the two facts above, answer the question "How can mammals generate heat?" with the following options: - layers of fat - Ice cubes - wishing - Depleting energy stores - death - with their fur - raising their temperature - by keeping them warm
Depleting energy stores