Ecosystems CKLA Ch 5

What can cause big changes in an ecosystem?

• A new plant

• A large animal

• A small change

• A sunny day

What happens to the land on either side of a stream over time?

• It grows taller

• It erodes

• It turns into a forest

• It becomes a desert

What holds the soil together on a hillside?

• The wind

• The rain

• Plant roots

• The sun

What is the first thing removed during a flood?

• Clay

• Rocks

• Topsoil

• Water

What are the ancient trees in Petrified Forest National Park made of?

• Metal

• Sand

• Stone

• Wood

What type of ecosystem was in Petrified Forest National Park 200 million years ago?

• A desert

• A beach

• A forest

• A mountain

What covered the trees in the Petrified Forest millions of years ago?

• Sand

• Snow

• Mud

• Leaves

What happened to the trees instead of rotting?

• They grew taller

• They became fossils

• They turned to rock

• They disappeared

What is the current landscape of Petrified Forest National Park?

• A lush forest

• A rocky desert

• A snowy mountain

• A sandy beach

How many species of plants are in Petrified Forest National Park?

• 500

• 200

• 1000

• 100