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