POB Earth Science UNIT 1,2,3,4(Mid)

Where does a mid-ocean ridge form?

When tectonic plates collide,what causes subduction?

Seasons are caused by__________.

Where is the epicenter of an earthquake?

___________defines the length of day on Earth as well as other planets.

__________ occur after the main earthquake and are usually weaker.

What is located at 0 degres longitude?

__________ changes sediments into sedimentary rocks.

Why is water an agent of erosion instead of weathering?

_________rocks are formed when magma cools and rehardens.

If you have 100g of a radioactive element,then how much would be left after 2 half lives?

What does the elastic rebound theory cause?

_____________rocks are formed by great heat and pressure.

Which seismic wave is the most destructive?

__________ rocks form when molten magma cools and hardens.

Rocks are classified by_______.

Where would frost wedging most likely occur?

Which process changes a rocks surface area but not its chemical composition.

The slight chang e of Earth's axis that is superimposed on precession is__________.

________ was the supercontinent in the continental drift hypothesis.

What occurs naturally and is composed of minerals?

Which rock type contains fragments of several rocks?

How is energy produced in the Sun?

What forms on the seafloor at a divergent plate boundary?

Why is the age of the seafloor relatively young when compared to other regions of crust?

____________ occur before the main earthquake.

The ___________is not one of Earth's main spheres.

What is the site at which an earthquake originates called?

Given a soil sample containing 40%sand and 30% silt, how much clay is present?

_________ causes Earth's axis to very slowly trace a cone in the sky.As a result the north star changes over time.

When magma continually rises and falls in the asthenosphere, it is known as ___________.