FOSS Pebbles, Sand and Silt Investigation 1 Set B

A gray, smooth rock that was once hot, liquid lava that came out of a volcano. (noun) 1. I have a piece of basalt in my rock collection. 2. I saw basalt when I was walking up the volcano.

A group of objects to be see, studied or kept together. (noun) 1. Museums have a collection of rocks for us to look at when we visit. 2. Toad has a funny collection of buttons on his jacket.

A piece of solid, often transparent material with shiny, flat surfaces that can be identified by its special shape or pattern. (noun) 1. I think that a crystal looks like a diamond. 2. I saw a bright crystal sticking out of the wall of the cave.

Not sharp or shiny. (adjective) 1. I can’t write with my pencil anymore because the tip is dull. 2. The dull gray rocks that wash up from the ocean have been smoothed by the water and sand.

A scientist who studies Earth and rocks. (noun) 1. A geologist came to my class to teach us about rocks. 2. I want to be a geologist and work on volcanoes when I grow up.

A building in which collections of scientific, historical or artistic value are studied and exhibited. (noun) 1. I went to see the dinosaur fossils at the museum. 2. There is a large collection of rocks at the Museum of Natural History.

Having sharp edges or corners. (adjective) 1. It is much easier to write with a pointed pencil. 2. Be careful! You can cut your hand if you hold the pointed edges of the rock too tightly.

Bumpy; not smooth (adjective) 1. I hit my head on the roof of the car when we drove down a bumpy road. 2. The surface of basalt, scoria and tuff feel bumpy.

A reddish, bubbly rock that was once the bubbly top of lava. (noun) 1. I bet that the lava was really hot before it became scoria. 2. The scoria I saw at the museum looks like hard red bubbles.

A light, soft rock that has ashes in it from the fires of a volcano A light, soft rock that has ashes in it from the fires of a volcano. (noun) 1. The tuff I bought is as light as cotton. 2. How did the tuff get ashes in it before it became a rock?

Having lines of different shades or colors. (adjective) 1. A zebra is black and white striped. 2. Some striped rocks have lines of bright colors.

Flat, level; not rough. (adjective) 1. The smooth rock I found was in the river for a long time. 2. The skin of my apply has no bumps and is very smooth.