How is density used to describe matter?

How is density used to describe matter? Density is a physical property of matter that expresses a relationship of mass to volume. The more mass an object contains in a given space, the more dense it is. Since different substances have different densities, density measurements are a useful means for identifying substances. How can you […]

What causes a painful lump behind the ear?

What causes a painful lump behind the ear? Lumps behind the ear can have many possible causes, including problems in the skin or bone. Swollen lymph nodes, infections, and certain cancers can also lead to lumps. Most cases of a lump behind the ear do not present a cause for concern, however, and normally resolve […]

When was NFPA 1851 established?

When was NFPA 1851 established? NFPA 1851 is the Standard on Selection, Care, and Maintenance of Protective Ensembles for Structural Fire Fighting and Proximity Fire Fighting as established by NFPA. The current edition of the standard is NFPA 1851, 2014. The first edition of this standard was introduced in 2001. Are NFPA standards mandatory? In […]

How do humans destroy estuaries?

How do humans destroy estuaries? Dredging, Draining, Bulldozing, and Paving Thousands of acres of estuary habitat, including salt marshes, seagrass meadows, and mangroves, are altered or destroyed every year. Some of the activities that cause this destruction include dredging, draining, bulldozing, and paving. What are the threats to estuaries? Common threats to estuaries increased nutrients […]

Is there actually a criminal underworld?

Is there actually a criminal underworld? A criminal organization can also be referred to as a gang, mafia, mob, ring, or syndicate; the network, subculture, and community of criminals may be referred to as the underworld. What was the FBI messaging app? Monitoring the FBI-controlled app, called ANOM, gave law enforcement an opportunity to learn […]

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