A review sheet came home yesterday for the Earth Materials Test. Feel free to review these concepts with your child:
- Sedimentary rock is formed in layers and has many fossils.
- You can decide the age of a rock layer by finding its position in a series of layers because the top layer is the youngest and the bottom layer is the oldest.
- Fossils are clues of past changes in the earth’s surface and climate. A seashell fossil found on land far from the ocean gives us a clue that the land was once under water.
- Examples of parts of organisms that become fossils are the bones, skull, shell or teeth.
- A mineral is a solid that forms naturally, is not alive, and has the same chemical make-up wherever it is found.
- Rocks are made up of at least two minerals.
- Minerals can be recognized by color, luster, texture, streak, and hardness.
- Rocks formed in layers and usually formed near water are called sedimentary.
- Rocks formed by changing materials under heat and pressure are called metamorphic.
- Rocks formed when melted rock (magma) is forced up from the Earth and cools are igneous.
- Rocks can change form from heat, pressure, and chemicals.
- Properties used when observing rocks are their color and size.
- Soil are small bits of crushed rock containing living or once living matter.
- Sand are rocks broken into smaller pieces by water, wind, and pressure.