Saturday Science

Which of the following has the largest population in the Indian River Lagoon ecosystem?

• crab
• egret
• flounder
   
• sea grass

Which of the following statements most accurately describes the energy transfer between the levels of the food pyramid in the Indian River Lagoon?

•  Energy stays in the phytoplankton at the lowest level.
• Energy is released into the environment only from the egret.
• Energy travels up from the phytoplankton to the clam worm.
• Energy moves from the flounder to both the clam worm and egret.

Which of the following statements most accurately describes the energy transfer between the levels of the food pyramid in the Indian River Lagoon?

•  Energy stays in the phytoplankton at the lowest level.
• Energy is released into the environment only from the egret.
• Energy travels up from the phytoplankton to the clam worm.
• Energy moves from the flounder to both the clam worm and egret.

Felipe and Marsha were studying forces and decided to do an experiment. They placed four equally sized blocks made of different materials on an elevated plastic tray. They watched each of the blocks move down the tray. Their setup is shown below. 
Which of the following forces causes the blocks to move down the tray?

• electric
• friction
• gravity
• magnetic

Which block would experience the least amount of friction as it moved down the tray?

• Ice Block
• Sponge Block
• Sandpaper Block
• Plastic Block

Which of the following conclusions can Felipe and Marsha make about the forces that cause the blocks to move down the tray?

• The force of friction is the same on each block.
• The force of friction causes the speed of each block to increase.
• The force of gravity causes all the blocks to move at the same speed
• The force of gravity is greater than the force of friction on all the blocks

Jacob started creating a diagram to show some of the common characteristics of the planets in our solar system. 
Which characteristic should Jacob write in the empty circle of the diagram?

• Made Mostly of Gas
• Has a Rocky Surface
• Revolves around a Star
• Is a Satellite of Another Planet

Keisha wants to show Amy what happens during one Earth day. Keisha holds a small globe representing Earth, and Amy holds a large ball representing the Sun.
What should Keisha do to show Amy what happens during one Earth day?

• Keisha should move the globe in one complete circle around Amy.
• Keisha should move the globe toward Amy and then away from her.
• Keisha should slowly lift the globe above her head and then lower it.
• Keisha should slowly spin the globe one complete time about its axis

Earth has a great variety of surface features that are caused by weathering and erosion. Which of the following describes a change due only to weathering?

• ocean waves washing sand off the beach
• rivers carrying soil and rocks through valleys
• wind blowing sand and pebbles off a sand dune
• tree roots breaking rocks into smaller pieces of rock

A model of the water cycle was made using an aquarium with a glass cover, a container of ice cubes, water, and a lamp.
Which part of the water cycle causes the water droplets to form on the glass cover?

• condensation
• evaporation
• precipitation
• runoff