The moons #RockinReview

Waxing: During this phase of the moon fifty percent of it is illuminated and visible from the Earth.

Waning: the moon at any time after full moon and beforenew moon

Gibbous: having the observable illuminated part greater than a semicircle and less than a circle.

Crescent: the curved sickle shape of the waxing or waning moon.

When theres a waxing moon it looks the opposite of a waning moon.

Plate Tectonics

Alfred Lothar Wegener was a German polar researcher, geophysicist and meteorologist.

Convergent- coming closer together.

Divergent- tending to be different.

Transform boundaries- locations of recurring earthquake activity and faulting.

The juan de fuca plate is on the border of washington

Convection currents move the plates

A large area of the earth in which plates of the earth's crust are moving away from eachother, forming an extensive system of fractures and faults, is called a rift zone.

Subduction zone -a long narrow, often arcuate, zone along which subduction takes place.

The term "scabland" sometimes is applied to rough or barren regions with little or no economic potential – especially for agriculture.

Rocks and Rolls
In Earth's History

#RocksAndRoles #TackkThursday #ThrowbackThursda

Sedimentary- rock that has formed from sediment deposited by water or air./ Breccia

Metamorphic- rock that has undergone transformation by heat, pressure, or other natural agencies./ Schist

Igneous- rock having solidified from lava or magma./ Diorite

Stratification- The process by which materials form or are deposited in layers.

Stratified rock

You can determine how old a rock is by how much layers it has. Also,if any of the fossils are unique to one of the geologic time periods, then the rock was formed during that particular time period. You can also determine the age of a rock by measuring the amount of certain radioactive elements in the rock.

Rocks changing

If there were some layers of horizontal rock and they were tipped it was because an earthquake or some natural disaster.

Also there are some living organisms that have helped shape landforms. One of them is a coral reef. Over thousands to millions of years, they may form massive structures of limestone that alter the shoreline of continents.