Investigating God's World Lesson: 4.1 -4.3

natural resource

any material found in God's creation which is heplful to man

obsidian

clear, shiny black rock; called volcanic glass

humus

decaying plant and animal found in soil.

shale

formed from mud (usually clay)

pumice

forms from lava that is full of gases

soil

loose, weathered material on Earth's surface in which plants can grow.

Sandstone

sand is the main component

geologist

scientists who study the structure of the earth

granite

speckled rock contains several different types and colors of minerals

marble

was once a limestone

slate

was once a shale

conservation

wise use of natural resources

igneous rock

- when magma cools, it hardens forms the fiery rocks ex: obsidian, pumice, granite

metamorphic rock

- rock that has been changed by heat and pressure ex: marble, slate

sedimentary rock

- sediments pressed together under the water ex: limestone, sandstone, shale

3 layers of the earth

1. Crust: thin, outermost layer (lowest) 2. Mantle: next layer, made up of rocks of medium density 3. Core: center and innermost layer made up of the highest density

What are the 2 parts of the core?

1. outer core (liquid - nickel) 2. inner core (solid - ball of iron)

limestone

made from bones and seashells

lava

magma that reaches the earth's surface

magma

molten rock