Weird Science Kids
fun cool exciting easy science experiments and
Eduacational Toys for kids
In this science project we will make a cut out model of a globe with a little help from a tennis ball. We can learn
about plate tectonics and how the plates fit together on earth!
A globe is a three-dimensional scale model of Earth (terrestrial globe) or other spheroid celestial body such as a
planet, star, or moon. It may also refer to a spherical representation of the celestial sphere, showing the apparent
positions of the stars and constellations in the sky (celestial globe). The word "globe" comes from the Latin word
globus, meaning round mass or sphere.
Materials for Globe Cut Out Model
- Computer and Printer (color printer works best)
- Tennis Ball
Process for Globe Cut Out Model
1) First click this link and get the Globe cut out template.
Globe Cut Out Model Template
2) Print out the globe cut out template.
3) Cut the template out by following the lines of the picture. Then cut into 4 sections as illustrated on the template.
Write the section number on the back of each.
4) Get your tennis ball and glue out. Glue the sections in correct order onto the tennis ball.
5) Cut out the base pattern and glue the ends together.
6) Set the globe on its base!
The Science of Plate Tectonics
Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός "pertaining to building") is a scientific
theory which describes the large scale motions of Earth's lithosphere. It is vital for the existence of life on earth
because of the role that it plays in the global cycle that maintains the balance of carbon between the biosphere,
pedosphere, geosphere, hydrosphere, and atmosphere. The theory builds on the older concepts
of continental drift, developed during the first decades of the 20th century by Alfred Wegener, and seafloor
spreading, developed in the 1960s.
The lithosphere is broken up into what are called tectonic plates. In the case of Earth, there are currently seven to
eight major (depending on how they are defined) and many minor plates (see list below). The lithospheric plates
ride on the asthenosphere. These plates move in relation to one another at one of three types of plate boundaries:
convergent, or collisional boundaries; divergent boundaries, also called spreading centers; and transform
boundaries. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate
boundaries. The lateral movement of the plates is typically 50–100 mm annually.
Tectonic plates are able to move because the Earth's lithosphere has a higher strength and lower density than the
underlying asthenosphere. Their movement is driven by heat dissipation from the mantle. Lateral density variations
in the mantle result in convection, which is transferred into tectonic plate motion through some combination of drag,
downward suction at the subduction zones, and variations in topography and density of the crust that result in
differences in gravitational forces. The relative importance of each of these factors is unclear.
Types of plate boundaries
Three types of plate boundary.Three types of plate boundaries exist, characterized by the way the plates move
relative to each other. They are associated with different types of surface phenomena. The different types of plate
1.Transform boundaries occur where plates slide or, perhaps more accurately, grind past each other along
transform faults. The relative motion of the two plates is either sinistral (left side toward the observer) or dextral
(right side toward the observer). The San Andreas Fault in California is an example of a transform boundary
exhibiting dextral motion.
2.Divergent boundaries occur where two plates slide apart from each other. Mid-ocean ridges (e.g., Mid-Atlantic
Ridge) and active zones of rifting (such as Africa's Great Rift Valley) are both examples of divergent boundaries.
3.Convergent boundaries (or active margins) occur where two plates slide towards each other commonly forming
either a subduction zone (if one plate moves underneath the other) or a continental collision (if the two plates
contain continental crust). Deep marine trenches are typically associated with subduction zones. The subducting
slab contains many hydrous minerals, which release their water on heating; this water then causes the mantle to
melt, producing volcanism. Examples of this are the Andes mountain range in South America and the Japanese
Credits: Globe cut out model courtesy of AGSO. Wikipedia source for plate tectonics information.