Late Paleozoic part 1

Cores of former mountains became deeply eroded valleys and the hills are ridges of resistant sandstones and other rocks that once flanked peaks.

• Inverse Typography

• Inverse Topography

• Variscan Orogeny

• Appalachian Orogeny

What led to the inverse topography of the Alleghenies mountains?

Answer explanation

Erosion of the Alleghenian mountains down to their roots

Gondwanide Glaciation

Precession

Answer explanation

The slight wobble of Earth's axis over time causing Earth to occasionally tip away from the Sun's radiant energy.

The tilt of Earth’s axis which affects where and how much sunlight falls on the globe

• Ubiquity

• Obliquity

• Eccentricity

• Cyclical tilting

Deviation over time in Earth’s elliptical orbit around the Sun.

• Ubiquity

• Obliquity

• Eccentricity

• Cyclical tilting

The deeper-water shales are replaced by _______ ______ ________, which are replaced in turn by marginal-marine and then continental deposits.

Much of the world’s reserves of salt come from _______ ______.

The Carboniferous was a time of transition from a _______ sea to an _________ sea.

This aragonite sea lasted until midway through the Jurassic Period, when there was a return to calcite seas.

• True

• False