When the magma appears above the earth, it is called ________.

These are also called transformed rocks.

These are called layered rocks.

What is needed to transform the mineral structure and physical properties of a rock?

Which type of rock is the strongest of all the three groups?

Basalt rocks are dense and dark but not shiny. What type of rock is it?

Marble rocks are formed from limestones. They are good for decorating and carving. What type of rock is marble?

Gneiss is changed from granite, which is an igneous rock. What type of rock is it?

Sandstone rocks are small grains of granite cemented together. We use them as building stones. What type of rock is it?

Obsidian rocks are glossy and sharp. They are formed after lava cools quickly above the ground. What kind of rock is it?

Limestones are packed with dead sea animals and shells. We use them to make concrete. What type of rock is limestone?