Welsbacher, Anne

Uses everyday examples to describe pulleys as simple machines that make lifting, pulling, and moving easier.

Uses everyday examples to describe levers as simple machines used to lift, push, or move a load.

Uses everyday examples to describe inclined planes as simple machines that make lifting, pushing, moving, and building easier.

Uses everyday examples to show how wedges are simple machines that make pushing, pulling apart, and lifting easier.

Uses everyday examples to show how screws are simple machines that make joining things together, moving, and lifting easier.

Discusses mako sharks including their habitat, what they eat, and their attack methods.

Describes the physical characteristics of tiger sharks, their hunting and eating habits, relationship with humans, and their future.

Describes the physical characteristics of hammerhead sharks, their hunting and eating habits, relationship with humans, and their future.

Describes the physical characteristics, social, feeding, and hunting behavior, and life cycle of the biggest of all wild cats.

Describes the physical characteristics, behaviors, and habitats of this wild cat found in many places throughout the world.