CFU 3-7-25 Types of Rocks 5.10B and Fossils 5.9D

Sedimentary rocks are formed from sediments of weathered material that have been eroded and then deposited in layers. This process requires__________.

• cool temperatures and time

• deposition and melting.

• mining and transportation.

• time and pressure

The most important factor in shaping sedimentary rock layers below is______.

• a volcanic eruption

• the scorching sun

• moving water

• an earthquake

A group of students explores the steps required for sedimentation of rocks. They record the result of the process in the table. Which of the best completes the table?

• Melting

• Transporting

• Compacting

• Fragmenting

Choose the sentence that best describes the properties of a metamorphic rock:

• Sandy and gritty, has defined layers, and is somewhat soft and breakable.

• Clearly visible bubbles and are very light. It floats on water!

• Hard and strong. Has bands of minerals that form wavy stripes.

• Large mineral crystals of varying colors and sizes. Some are pink, some are black, and some are clear.

Metamorphic rocks have a special nickname because they change from one type of rock into another under heat and pressure. What is this nickname, and why does it make sense?

• "Sleeping Rocks" – Because they take a long time to form and stay unchanged.

• "Recycled Rocks" – Because they are made from existing rocks that change into something new.

• "Young Rocks" – Because they are the newest type of rock to form on Earth.

• "Floating Rocks" – Because they are lighter than other types of rocks.

Gabbro is a type of rock. When melted rock cools below the earth's surface, it can form gabbro. Large parts of the ocean floor are made of gabbro.

What type of rock is gabbro?

• Sedimentary

• Igneous

• Metamorphic

Conglomerate is a type of rock. It is made up of grains of many different sizes, such as sand, mud, and pebbles. Conglomerate forms when layers of these sediments are pressed together to form rock.

• Metamorphic

• Igneous

• Sedimentary

The Marble Caves are a rock formation in Chile. They are made of marble, which formed when limestone was changed by high temperature and pressure.

The Marble Caves are located on the shores of a lake. The formation is made up of caves, tunnels, and pillars. These features were formed as water from the lake eroded away rock.

• Sedimentary

• Igneous

• Metamorphic

Select the fossil.

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• 
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Look at the two pictures below. The African elephant is a modern organism, and the woolly mammoth is an extinct one. The African elephant has many of the traits that the woolly mammoth had.

Which of the following statements are supported by these pictures? Select all that apply.

• The elephant has ears, and the mammoth does too.

• The elephant and mammoth both have tusks.

• The elephant and mammoth both have long trucks.

• The elephant and mammoth both have thick fur.