The introduction of harmful materials into the environment.

means to use less of something

Means to use something again.

Means to turn old things into new things.

The struggle among living things for resources.

TRUE or FALSE

Every living thing changes its environment as it meet its needs.

TRUE or FALSE

Every living thing changes its environment as it meet its needs. A spider spins a web to catch insects for food.

TRUE or FALSE

Every living thing changes its environment as it meet its needs. A bird builds nest for shelter.

TRUE or FALSE

Every living thing changes its environment as it meet its needs. A plant takes water from the soil.

TRUE or FALSE

Other living things make bigger changes to their Environments. For example bacteria, worms and fungi break down leaves and other dead material. These decomposers return valuable nutrients to the soil. Later, plants can use those nutrients to grow.

TRUE or FALSE

All of living things are trying to get resources. A

resource is something that helps an organism to survive.

TRUE or FALSE

Food, water, air, space, sunlight, and shelter are some examples of resources.

These are some examples of resources.

TRUE or FALSE

Every energy has a limited amount of resources.

TRUE or FALSE

Every energy has unlimited amount of resources.

TRUE or FALSE

Every energy has unlimited amount of resources. As a result, things must compete for them.

TRUE or FALSE

Competition is the struggle among living things for resources. Competition can be a cause of environmental change.

TRUE or FALSE

Competition is the struggle among living things for resources. Competition cannot be a cause of environmental change.

TRUE or FALSE

People change their environments more than any other organism.

TRUE or FALSE

People change their environments more than any other organism. Changes such as planting trees are helpful. However, other changes can be harmful.

TRUE or FALSE

People can harm their environments by creating pollution.

TRUE or FALSE

Pollution happens when harmful materials get into the air, land or water. Cars can pollute the air. Trash pollutes the water and land.

TRUE or FALSE

Clearing Land is when People cut down trees to make

wood products. If forests are removed, living things can be left without habitat. Soil can wear away without tree roots to hold it in place.

TRUE or FALSE

If forests are removed, living things can be left without habitat. Soil can wear away without tree roots to hold it in place.

TRUE or FALSE

COMPETITION happens when Sometimes people bring organisms into an environment. These new organisms can harm the environment by competing with local organisms for limited resources.

How do people change their environment?

How can people protect their environment?

TRUE or FALSE

People can protect their environments. One thing people can do is practice “3 Rs”.

~ Reduce- to use less of something

~ Reuse- to use something again

~ Recycle- to turn old things into new things.

Changes their position

Never change their position

Can be used as REFERENCE POINTS to describe movement

What are the reference directions?

TRUE or FALSE

You can also use a MOVING OBJECT as reference point, if you are observing from a moving object.

you consider ___ and ___to identify speed

TRUE or FALSE

When the surfaces of two objects rub against each other, the motion may be slow or fast.

push or pull

it can move any object at rest or it can stop any object in motion. It can even change the direction of any moving object.

equal but opposite forces

same amount of force in opposite directions

TRUE or FALSE

When the force is balance there is NO motion or change in position.

Two unequal but opposite forces

TRUE or FALSE

When you toss anything like a ball or paper upward, it will go down.

TRUE or FALSE

If you are walking on a wet floor you need more friction so you will not slide.

TRUE or FALSE

When you are pushing a cart full of stuff, you need less friction to make it easier to move the cart.

Other things with force that move objects.