Classify Boundaries From Plate Motion Arrows

Seismic Waves Reveal Earth's Interior is a good opening, and Classify Boundaries From Plate Motion Arrows gives students the vocabulary for the mountain sheets. The earthquake hazard sheet uses a fictional region, so it works on its own.

Read plate motion arrows on a map of five made-up plates to classify six boundaries. The directions on the page read: Study the map of five made-up plates and the rule box. You will use them on page 2. An answer key is included.

Yes, both. We made it for 7th grade Earth science, and it works the same at home or at school. At home, a student can work through it alone and then go over it with you, which shows quickly what is solid and what needs another look. In class it works as independent practice, homework or a warm-up, and you can print one copy or a full set.

P waves travel through solids and liquids, but S waves travel only through solids. Where waves arrive or stop tells scientists which layers are solid or liquid. Seismic Waves Reveal Earth's Interior also gives depth and density for each layer.

New ocean floor forms at a mid-ocean ridge, and rock farther from the ridge is older. Magnetic minerals in cooling lava lock in Earth's magnetic field, leaving stripes of normal and reversed polarity. Seafloor Age and Magnetic Stripe Evidence has students graph age against distance.

India moved north and collided with Asia about 50 million years ago. Continental crust is thick and light, so neither plate sank far into the mantle. Continental Collision and the Himalayas uses three cross sections.

A forecast gives the probability of an event over a period of time. A prediction names the time and often the place and size of a coming event. Earthquake Hazard Maps and Probability explains why scientists can forecast earthquakes but not predict them.